Remove all autotools usage (#10132)

* Bazelfying conformance tests

Adding infrastructure to "Bazelify" languages other than Java and C++

* Delete benchmarks for languages supported by other repositories

* Bazelfying benchmark tests

* Bazelfying python

Use upb's system python rule instead of branching tensorflow

* Bazelfying Ruby

* Bazelfying C#

* Bazelfying Objective-c

* Bazelfying Kokoro mac builds

* Bazelfying Kokoro linux builds

* Deleting all deprecated files from autotools cleanup

This boils down to Makefile.am and tests.sh and all of their remaining references

* Cleanup after PR reorganizing

- Enable 32 bit tests
- Move conformance tests back
- Use select statements to select alternate runtimes
- Add internal prefixes to proto library macros

* Updating READMEs to use bazel instead of autotools.

* Bazelfying Kokoro release builds

* First round of review fixes

* Second round of review fixes

* Third round of review fixes

* Filtering out conformance tests from Bazel on Windows (b/241484899)

* Add version metadata that was previously scraped from configure.ac

* fixing typo from previous fix

* Adding ruby version tests

* Bumping pinned upb version, and adding tests to python CI

php/README.md

diff --git a/php/README.md b/php/README.md
index c4292cf..775fbc8 100644
--- a/php/README.md
+++ b/php/README.md
@@ -26,8 +26,6 @@
 #### Prerequirements
 
 To install the c extension, the following tools are needed:
-* autoconf
-* automake
 * libtool
 * make
 * gcc
@@ -36,7 +34,7 @@
 
 On Ubuntu, you can install them with:
 ```
-sudo apt-get install -y php-pear php5-dev autoconf automake libtool make gcc
+sudo apt-get install -y php-pear php-dev libtool make gcc
 ```
 On other platforms, please use the corresponding package managing tool to
 install them before proceeding.
@@ -98,24 +96,18 @@
 
 ## Development
 
-### Docker Image
-
-We provide a docker image for php development, which is also used in our automatic tests:
-```
-docker run --security-opt seccomp=unconfined -it protobuftesting/php_8dbe419c6df1a8b3af0ae3a267c112efb436b45c
-```
-
 ### Test Native PHP
 
 ```
+# Install Dependencies (Linux)
+apt-get install bazel composer php-dev
+
 # Download protobuf
 git clone https://github.com/protocolbuffers/protobuf.git
 cd protobuf
 
 # Build protoc
-./autogen.sh
-./configure
-make -j4
+bazel build :protoc
 
 # Test native php
 cd php