Creation of C Flags Build Variables

Modifications made to soong/cc to look for specific C Flags used by
Android modules and store name of module into a build variable array.

Bug: 140442588
Test: Executed m dist and presubmit
Change-Id: If46a11462369c43bbcd445156aff0641514c58b1
diff --git a/Android.bp b/Android.bp
index 7e6da6e..1dfac87 100644
--- a/Android.bp
+++ b/Android.bp
@@ -172,6 +172,7 @@
         "cc/vndk_prebuilt.go",
         "cc/xom.go",
 
+        "cc/cflag_artifacts.go",
         "cc/cmakelists.go",
         "cc/compdb.go",
         "cc/compiler.go",