Revert change for bug 415014. r=KaiRo

tools/tinderbox-configs/seamonkey/linux/CLOBBER

@@ -1 +1 @@
-Clobbering to force rebuild with updated CFLAGS and CXXFLAGS in mozconfig
+Clobbering to force rebuild with reverted CFLAGS and CXXFLAGS in mozconfig

tools/tinderbox-configs/seamonkey/linux/mozconfig

@@ -4,8 +4,8 @@
 #
 
 # symbols for breakpad
-export CFLAGS="-gstabs+ -march=i486 -mtune=generic"
-export CXXFLAGS="-gstabs+ -march=i486 -mtune=generic"
+export CFLAGS="-gstabs+"
+export CXXFLAGS="-gstabs+"
 
 export MOZILLA_OFFICIAL=1