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/beos b/configs/beos
index f07973d..9974b7b 100644
--- a/configs/beos
+++ b/configs/beos
@@ -39,6 +39,10 @@
 
 	CXXFLAGS = $(CFLAGS)
 
+	# Work around aliasing bugs - developers should comment this out
+	CFLAGS += -fno-strict-aliasing
+	CXXFLAGS += -fno-strict-aliasing
+
 	LDFLAGS += -Xlinker
 
 	ifdef DEBUG