gcc/config/i386/mingw32.h: Ensure `-lmsvcrt` precede `-lkernel32`

gcc/config/i386/mingw32.h: Ensure `-lmsvcrt` precede `-lkernel32`

This is necessary as libmsvcrt.a is not a pure import library, but
also contains some functions that invoke others in KERNEL32.DLL.

gcc/
	* config/i386/mingw32.h (REAL_LIBGCC_SPEC): Insert -lkernel32
	after -lmsvcrt. This is necessary as libmsvcrt.a is not a pure
	import library, but also contains some functions that invoke
	others in KERNEL32.DLL.

Signed-off-by: Liu Hao <lh_mouse@126.com>
Signed-off-by: Jonathan Yong <10walls@gmail.com>