[NTDLL] Make _alloca_probe(_16) private

This avoids a linker error due to a duplicated symbol in ntdll and the statically linked chkstk library. This happens when the linker first resolves _chkstk from the CRT or the chkstk library (which also pulls in _alloca_probe(_16)) and then tries to resolve _alloca_probe(_16) from ntdll.

Author: tkreuzer

dll/ntdll/def/ntdll.spec

@@ -1767,8 +1767,8 @@
 @ cdecl -arch=i386 -ret64 _alldiv(double double)
 @ cdecl -arch=i386 _alldvrm()
 @ cdecl -arch=i386 -ret64 _allmul(double double)
-@ cdecl -arch=i386 -norelay _alloca_probe()
-@ cdecl -version=0x600+ -arch=i386 _alloca_probe_16()
+@ cdecl -arch=i386 -norelay -private _alloca_probe()
+@ cdecl -version=0x600+ -arch=i386 -private _alloca_probe_16()
 @ stub -version=0x600+ -arch=i386 _alloca_probe_8
 @ cdecl -arch=i386 -ret64 _allrem(double double)
 @ cdecl -arch=i386 _allshl()