Respect user optimization flags
bicatali@gentoo.org - 06/2013

--- astrometry.net-0.38.orig/util/makefile.common	2010-08-26 14:43:44.000000000 +0100
+++ astrometry.net-0.38/util/makefile.common	2012-05-09 23:21:10.000000000 +0100
@@ -145,8 +145,6 @@
 
 ifeq ($(OPTIMIZE),yes)
   # speedy!
-  FLAGS_DEF += -O3
-  FLAGS_DEF += -fomit-frame-pointer
   # turn off asserts:
   FLAGS_DEF += -DNDEBUG