libusb/Makefile.am: Remove unnecessary assignments

Remove the unnecessary assignment of EXTRA_DIST. Anything that could end
up in SOURCES is automatically included in the distribution.

Remove the unnecessary assignment of libusb_1_0_la_CFLAGS. AM_CFLAGS is
already the default value, but assigning to the variable makes automake
think that custom CFLAGS are needed and therefore causes a bunch of
pointless additional rules to be generated. As a reference, the
generated Makefile shed 21,560 bytes (from 52,029 bytes to 30,469).

Signed-off-by: Chris Dickens <christopher.a.dickens@gmail.com>
diff --git a/libusb/Makefile.am b/libusb/Makefile.am
index 2942219..ad6e8ab 100644
--- a/libusb/Makefile.am
+++ b/libusb/Makefile.am
@@ -33,18 +33,6 @@
 		 os/windows_usbdk.h os/windows_usbdk.c \
 		 os/windows_winusb.h os/windows_winusb.c
 
-EXTRA_DIST = $(POSIX_POLL_SRC) $(POSIX_THREADS_SRC) \
-	$(WINDOWS_POLL_SRC) $(WINDOWS_THREADS_SRC) \
-	$(OS_DARWIN_SRC) \
-	$(OS_HAIKU_SRC) \
-	$(OS_LINUX_SRC) \
-	$(OS_NETBSD_SRC) \
-	$(OS_NULL_SRC) \
-	$(OS_OPENBSD_SRC) \
-	$(OS_SUNOS_SRC) \
-	$(OS_WINDOWS_SRC) \
-	os/linux_netlink.c os/linux_udev.c
-
 if OS_DARWIN
 OS_SRC = $(OS_DARWIN_SRC)
 AM_CFLAGS_EXT = -no-cpp-precomp
@@ -97,7 +85,6 @@
 endif
 endif
 
-libusb_1_0_la_CFLAGS = $(AM_CFLAGS)
 libusb_1_0_la_LDFLAGS = $(LTLDFLAGS)
 libusb_1_0_la_SOURCES = libusbi.h version.h version_nano.h \
 	core.c descriptor.c hotplug.h hotplug.c io.c strerror.c sync.c \
diff --git a/libusb/version_nano.h b/libusb/version_nano.h
index 9dc01fa..197f76f 100644
--- a/libusb/version_nano.h
+++ b/libusb/version_nano.h
@@ -1 +1 @@
-#define LIBUSB_NANO 11477
+#define LIBUSB_NANO 11478