[Mac] Support bazelisk and drop -j argument. The support for -j was there since make didn't do parallel builds by default. Remove some references to the intermedia results of an autotools build.

diff --git a/objectivec/DevTools/compile_testing_protos.sh b/objectivec/DevTools/compile_testing_protos.sh
index eb43cae..604a5b5 100755
--- a/objectivec/DevTools/compile_testing_protos.sh
+++ b/objectivec/DevTools/compile_testing_protos.sh

@@ -120,8 +120,7 @@
   # under)
   readonly NewestInput=$(find \
      src/google/protobuf/*.proto \
-     objectivec/Tests/*.proto \
-     src/.libs src/*.la $PROTOC \
+     objectivec/Tests/*.proto $PROTOC \
      objectivec/DevTools/compile_testing_protos.sh \
         -type f -print0 \
         | xargs -0 stat -f "%m %N" \

diff --git a/objectivec/DevTools/full_mac_build.sh b/objectivec/DevTools/full_mac_build.sh
index 0af0e40..1e10653 100755
--- a/objectivec/DevTools/full_mac_build.sh
+++ b/objectivec/DevTools/full_mac_build.sh

@@ -10,6 +10,9 @@
 readonly ProtoRootDir="${ScriptDir}/../.."
 readonly BazelFlags="-k --test_output=streamed --macos_minimum_os=10.9"
 
+# Invoke with BAZEL=bazelisk to use that instead.
+readonly BazelBin="${BAZEL:=bazel}"
+
 printUsage() {
   NAME=$(basename "${0}")
   cat << EOF
@@ -28,8 +31,6 @@
    -r, --regenerate-descriptors
          Run generate_descriptor_proto.sh to regenerate all the checked in
          proto sources.
-   -j #, --jobs #
-         Force the number of parallel jobs (useful for debugging build issues).
    --core-only
          Skip some of the core protobuf build/checks to shorten the build time.
    --skip-xcode
@@ -59,7 +60,7 @@
   echo "========================================================================"
 }
 
-NUM_JOBS=auto
+BAZEL=bazel
 DO_CLEAN=no
 REGEN_DESCRIPTORS=no
 CORE_ONLY=no
@@ -82,10 +83,6 @@
     -r | --regenerate-descriptors )
       REGEN_DESCRIPTORS=yes
       ;;
-    -j | --jobs )
-      shift
-      NUM_JOBS="${1}"
-      ;;
     --core-only )
       CORE_ONLY=yes
       ;;
@@ -134,7 +131,7 @@
 
 if [[ "${DO_CLEAN}" == "yes" ]] ; then
   header "Cleaning"
-  bazel clean
+  "${BazelBin}" clean
   if [[ "${DO_XCODE_IOS_TESTS}" == "yes" ]] ; then
     XCODEBUILD_CLEAN_BASE_IOS=(
       xcodebuild
@@ -178,23 +175,23 @@
 
 if [[ "${REGEN_DESCRIPTORS}" == "yes" ]] ; then
   header "Regenerating the descriptor sources."
-  ./generate_descriptor_proto.sh -j "${NUM_JOBS}"
+  ./generate_descriptor_proto.sh
 fi
 
 if [[ "${CORE_ONLY}" == "yes" ]] ; then
   header "Building core Only"
-  bazel build //:protoc //:protobuf //:protobuf_lite -j "${NUM_JOBS}" $BazelFlags
+  "${BazelBin}" build //:protoc //:protobuf //:protobuf_lite $BazelFlags
 else
   header "Building"
   # Can't issue these together, when fully parallel, something sometimes chokes
   # at random.
-  bazel test //src/... $BazelFlags
+  "${BazelBin}" test //src/... $BazelFlags
   # Fire off the conformance tests also.
-  bazel test //objectivec:conformance_test $BazelFlags
+  "${BazelBin}" test //objectivec:conformance_test $BazelFlags
 fi
 
 # Ensure the WKT sources checked in are current.
-objectivec/generate_well_known_types.sh --check-only -j "${NUM_JOBS}"
+BAZEL="${BazelBin}" objectivec/generate_well_known_types.sh --check-only
 
 header "Checking on the ObjC Runtime Code"
 # Some of the kokoro machines don't have python3 yet, so fall back to python if need be.
@@ -354,7 +351,7 @@
 
 if [[ "${DO_OBJC_CONFORMANCE_TESTS}" == "yes" ]] ; then
   header "Running ObjC Conformance Tests"
-  bazel test //objectivec:conformance_test $BazelFlags
+  "${BazelBin}" test //objectivec:conformance_test $BazelFlags
 fi
 
 echo ""

diff --git a/objectivec/generate_well_known_types.sh b/objectivec/generate_well_known_types.sh
index 10b2a10..0fb9f4c 100755
--- a/objectivec/generate_well_known_types.sh
+++ b/objectivec/generate_well_known_types.sh

@@ -3,16 +3,15 @@
 # Run this script to regenerate *.pbobjc.{h,m} for the well known types after
 # the protocol compiler changes.
 
-# HINT:  Flags passed to generate_well_known_types.sh will be passed directly
-#   to bazel when building protoc.  This is particularly useful for passing
-#   -j4 to run 4 jobs simultaneously.
-
 set -eu
 
 readonly ScriptDir=$(dirname "$(echo $0 | sed -e "s,^\([^/]\),$(pwd)/\1,")")
 readonly ObjCDir="${ScriptDir}"
 readonly ProtoRootDir="${ObjCDir}/.."
 
+# Invoke with BAZEL=bazelisk to use that instead.
+readonly BazelBin="${BAZEL:=bazel}"
+
 # Flag for continuous integration to check that everything is current.
 CHECK_ONLY=0
 if [[ $# -ge 1 && ( "$1" == "--check-only" ) ]] ; then
@@ -31,7 +30,7 @@
 fi
 
 # Make sure the compiler is current.
-bazel build $@ //:protoc
+"${BazelBin}" build $@ //:protoc
 
 cd src
 declare -a RUNTIME_PROTO_FILES=( \