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libc: fix sign extension bug for GBIT64()

this bug caused all file i/o's arround 2GB to fail with "negative i/o offset"
because the low 32 bits of the offset got sign extended to 64 bit.

--- a/include/fcall.h

+++ b/include/fcall.h

@@ -37,7 +37,7 @@

 #define	GBIT8(p)	((p)[0])

 #define	GBIT16(p)	((p)[0]|((p)[1]<<8))

 #define	GBIT32(p)	((p)[0]|((p)[1]<<8)|((p)[2]<<16)|((p)[3]<<24))

-#define	GBIT64(p)	((vlong)((p)[0]|((p)[1]<<8)|((p)[2]<<16)|((p)[3]<<24)) |\

+#define	GBIT64(p)	((u32int)((p)[0]|((p)[1]<<8)|((p)[2]<<16)|((p)[3]<<24)) |\

 				((vlong)((p)[4]|((p)[5]<<8)|((p)[6]<<16)|((p)[7]<<24)) << 32))

 #define	PBIT8(p,v)	(p)[0]=(v)