Split local and global cflags

Native compiler flags are currently applied in approximately:
global cflags
local cflags
local include dirs
global include dirs
global conlyflags
local conlyflags
global cppflags
local cppflags

This means that a flag that is enabled in the global cppflags
cannot be disabled in the local cflags, and an Android.bp author
must know to disable it in the local cppflags.  A better order
would be:
global cflags
global conlyflags
global cppflags
local cflags
local conlyflags
local cppflags
local include dirs
global include dirs

We are mixing both the global and local cflags into a single
variable, and similar for conlyflags and cppflags, which
prevents reordering them.  This CL prepares to reorder them
by splitting the global and local cflags into separate variables.

Bug: 143713277
Test: m native
Change-Id: Ic55a8c3516c331dc5f2af9d00e59ceca9d3e6c15
diff --git a/cc/library_test.go b/cc/library_test.go
index 2acae35..f8d8934 100644
--- a/cc/library_test.go
+++ b/cc/library_test.go
@@ -181,7 +181,7 @@
 		}
 
 		libfoo := ctx.ModuleForTests("libfoo", "android_arm_armv7-a-neon_core_shared").Module().(*Module)
-		if !inList("-DGOOGLE_PROTOBUF_NO_RTTI", libfoo.flags.CFlags) {
+		if !inList("-DGOOGLE_PROTOBUF_NO_RTTI", libfoo.flags.Local.CFlags) {
 			t.Errorf("missing protobuf cflags")
 		}
 	})