Fix mingw32 some more.

src/build/Common.gmake

@@ -219,7 +219,7 @@ gcc_machine		:= $(findstring mingw32,$(shell ${CC} -dumpmachine))
 gcc_w64                 := $(findstring w64,$(shell ${CC} -dumpmachine))
 ifeq ($(gcc_machine),mingw32)
  os		:= Win32
- CFLAGS	+=	-DMSVCRT_VERSION=0x0800 -m32 -DDISABLE_MKSTEMP_DEFINE
+ CFLAGS	+=	-DMSVCRT_VERSION=0x0800 -m32
  ifeq ($(gcc_w64),w64)
   CFLAGS += -DDISABLE_MKSTEMP_DEFINE
  endif