tree cd9ab51ac0a877cd8c2159be971dbc2e14dfcad8
parent 56b4d45341e0235d95ffab75a26795cb490dbc60
author Colin Cross <ccross@android.com> 1429733273 -0700
committer Colin Cross <ccross@android.com> 1429736925 -0700

Simplify flags in c compiling, fix NDK build warnings

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