Add -fno-strict-aliasing workaround for all GCC targets

Use a GCC option to work around aliasing bugs. See commit 013dbcd for
more details.
diff --git a/configs/freebsd-dri b/configs/freebsd-dri
index 0f52b91..9d92154 100644
--- a/configs/freebsd-dri
+++ b/configs/freebsd-dri
@@ -22,6 +22,10 @@
 
 CXXFLAGS = $(WARN_FLAGS) $(OPT_FLAGS) $(PIC_FLAGS) $(DEFINES) -Wall -ansi -pedantic $(ASM_FLAGS) $(X11_INCLUDES) 
 
+# Work around aliasing bugs - developers should comment this out
+CFLAGS += -fno-strict-aliasing
+CXXFLAGS += -fno-strict-aliasing
+
 ASM_SOURCES = 
 
 # Library/program dependencies