File reveng-obey-cflags.patch of Package reveng

diff --git a/Makefile b/Makefile
index 9188d9a..31fd53d 100755
--- a/Makefile
+++ b/Makefile
@@ -25,7 +25,7 @@
 SHELL = /bin/sh
 # C compiler and flags.  Adjust to taste.
 CC = gcc
-CFLAGS = -O3 -Wall -ansi -fomit-frame-pointer
+CFLAGS += -O3 -Wall -ansi -fomit-frame-pointer
 # Binary optimiser
 STRIP = strip
 SFLAGS = --strip-unneeded