Support .asm files for assembly

Test: mmma -j external/libjpeg-turbo
Change-Id: Id192dae5d74ecbf500fc668931c37f9b91d25ca4
diff --git a/cc/util.go b/cc/util.go
index 1cb3dd7..9f958d1 100644
--- a/cc/util.go
+++ b/cc/util.go
@@ -97,6 +97,7 @@
 		ldFlags:     strings.Join(in.LdFlags, " "),
 		libFlags:    strings.Join(in.libFlags, " "),
 		tidyFlags:   strings.Join(in.TidyFlags, " "),
+		yasmFlags:   strings.Join(in.YasmFlags, " "),
 		toolchain:   in.Toolchain,
 		clang:       in.Clang,
 		tidy:        in.Tidy,