28344528cf
Reduce the number of flags variables when compiling C by getting rid of the separately-tracked IncludeDirs variables, and putting them directly in GlobalFlags. Also changes exportedIncludeDirs to exportedFlags, which will allow exporting flags besides -I. Also fixes a bug when building a module with the NDK and -Werror by passing NDK exported include directories with -isystem instead of -I, which will ignore warnings from those includes. Also fixes a bug where the default includes were being inserted into all cflags by the arm and arm64 toolchain modules. Change-Id: Ice97f84e637b21d20c38c85b881afa315f9f92ae