Attempt to fix 32 bit OSX build. The fix consists of adding -m32 and -m64

to the appropriate CFLAGS. In addition, memory hooks are very different
on OSX, so build of bcheck.c had to be disabled for now.

Change of the CFLAGS does affect builds on other platforms, and this needs
to be tested.

lib/Makefile

@@ -14,11 +14,11 @@ ifndef TARGET
  else
  ifeq ($(ARCH),i386)
   TARGET = i386
-  XCC = gcc -O2
+  XCC = gcc -O2 -m32
  else
  ifeq ($(ARCH),x86-64)
   TARGET = x86_64
-  XCC = gcc -O2
+  XCC = gcc -O2 -m64
  endif
  endif
  endif