remove autotools

In Meson we trust.

webrtc/base/Makefile.am

@@ -1,31 +0,0 @@
-noinst_LTLIBRARIES = libbase.la
-
-noinst_HEADERS = arraysize.h \
-		 atomicops.h \
-		 basictypes.h \
-		 constructormagic.h \
-		 safe_conversions.h \
-		 safe_conversions_impl.h \
-		 scoped_ptr.h \
-		 template_util.h \
-		 thread_annotations.h
-
-libbase_la_SOURCES = criticalsection.cc \
-		     criticalsection.h \
-		     checks.cc \
-		     checks.h \
-		     event.cc \
-		     event.h \
-		     platform_thread.cc \
-		     platform_thread.h \
-		     platform_file.cc \
-		     platform_file.h \
-		     stringutils.cc \
-		     stringutils.h \
-		     thread_checker.h \
-		     thread_checker_impl.cc \
-		     thread_checker_impl.h
-
-libbase_la_CXXFLAGS = $(AM_CXXFLAGS) $(COMMON_CXXFLAGS)
-
-EXTRA_DIST = BUILD.gn