Added src and exclude_src to debuggable builds

Fixes: 200976245
Test: manually tested
Change-Id: I68b6230f30aa2c15e6a80010cd639ea453b4b29e
Merged-In: I68b6230f30aa2c15e6a80010cd639ea453b4b29e
(cherry picked from commit 85a8afa9e7)

android/variable.go

@@ -116,6 +116,8 @@ type variableProperties struct {
 			Shared_libs       []string
 
 			Cmdline []string
+			Srcs         []string
+			Exclude_srcs []string
 		}
 
 		// eng is true for -eng builds, and can be used to turn on additionaly heavyweight debugging