tsan: fix makefile
allow to build custom configurations


git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@157259 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/tsan/rtl/Makefile.old b/lib/tsan/rtl/Makefile.old
index 3c715eb..1041ed8 100644
--- a/lib/tsan/rtl/Makefile.old
+++ b/lib/tsan/rtl/Makefile.old
@@ -8,6 +8,7 @@
 EXTRA_CXXFLAGS=-fno-exceptions
 NO_SYSROOT=--sysroot=.
 CXXFLAGS+=$(EXTRA_CXXFLAGS)
+CXXFLAGS+=$(CFLAGS)
 ifeq ($(DEBUG), 0)
   CXXFLAGS+=-fomit-frame-pointer
 ifeq ($(CXX), g++)