gcc: Remove size limit of PCH for *-*-mingw32 hosts

PCHs can now be relocated, so the size limit makes no sense any more.

This patch was submited to MSYS2 9 months ago for GCC 12. No issue has been reported so far.

Reference: https://github.com/msys2/MINGW-packages/blob/717d5a5a09e2370e3bd7e12b393a26dbfbe48921/mingw-w64-gcc/0010-Fix-using-large-PCH.patch


Signed-off-by: LIU Hao <lh_mouse@126.com>

gcc/ChangeLog:

	PR pch/14940
	* config/i386/host-mingw32.cc (mingw32_gt_pch_get_address):
	Remove the size limit `pch_VA_max_size`

Signed-off-by: Jonathan Yong <10walls@gmail.com>