build/make: Add rule for .cc files.

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@145646 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/Makefile b/Makefile
index 22013c0..92938aa 100644
--- a/Makefile
+++ b/Makefile
@@ -228,6 +228,9 @@
 $(Tmp.ObjPath)/%.o: $(Tmp.SrcPath)/%.c $(Tmp.Dependencies) $(Tmp.ObjPath)/.dir
 	$(Summary) "  COMPILE:   $(Tmp.Name)/$(Tmp.Config)/$(Tmp.Arch): $$<"
 	$(Verb) $(Tmp.CC) $(Tmp.CFLAGS) -c -o $$@ $$<
+$(Tmp.ObjPath)/%.o: $(Tmp.SrcPath)/%.cc $(Tmp.Dependencies) $(Tmp.ObjPath)/.dir
+	$(Summary) "  COMPILE:   $(Tmp.Name)/$(Tmp.Config)/$(Tmp.Arch): $$<"
+	$(Verb) $(Tmp.CC) $(Tmp.CFLAGS) -c -o $$@ $$<
 .PRECIOUS: $(Tmp.ObjPath)/.dir
 
 endef