PR modula2/118010 libc.def lseek procedure off_t bugfix

PR modula2/118010 libc.def lseek procedure off_t bugfix

This patch fixes calls to lseek from m2 sources.  The new data
type SYSTEM.COFF_T is used instead of SYSTEM.CCSIZE_T.

gcc/m2/ChangeLog:

	PR modula2/118010
	* gm2-libs-log/FileSystem.mod (doModeChange): Replace
	LONGINT with COFF_T.
	(SetPos): Use COFF_T for the return value and offset type
	when calling lseek.
	* gm2-libs/FIO.mod (SetPositionFromBeginning): Convert pos
	to COFF_T.
	(SetPositionFromEnd): Ditto.
	* mc-boot/GFIO.cc: Rebuild.
	* mc-boot/Glibc.h: Ditto.
	* pge-boot/GFIO.cc: Ditto.
	* pge-boot/Glibc.h: Ditto.

Signed-off-by: Gaius Mulley <gaiusmod2@gmail.com>