[firefox] Don't overwrite CFLAGS/CXXFLAGS

[Christopher Aillon]

commit b2dc87063de98cbf11714831b19bcc22c048c89f
Author: Christopher Aillon <caillon at redhat.com>
Date:   Sat Jan 29 14:52:59 2011 -0800

    Don't overwrite CFLAGS/CXXFLAGS
    
    The -debuginfo mozconfig was stomping on our CFLAGS/CXXFLAGS.

 firefox-mozconfig-debuginfo |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/firefox-mozconfig-debuginfo b/firefox-mozconfig-debuginfo
index a0ef07a..8a874b4 100644
--- a/firefox-mozconfig-debuginfo
+++ b/firefox-mozconfig-debuginfo
@@ -1,5 +1,5 @@
 # For mozilla's debuginfo:
-export CFLAGS="-gstabs+"
-export CXXFLAGS="-gstabs+"
+export CFLAGS="$CFLAGS -gstabs+"
+export CXXFLAGS="$CXXFLAGS -gstabs+"
 export MOZ_DEBUG_SYMBOLS=1
 ac_add_options --enable-crashreporter