* src/w32/subproc/sub_proc.c (process_wait_for_multiple_objects):
Fix format specifier for GetLastError's value.

* src/job.c (reap_children): Define the 'remote_status_lose' label
only for Posix platforms, to avoid compiler warning.

* build_w32.bat (LNKOUT): New variable, using forward slashes.
Use forward slashes in calls to :Compile, so that linking with GNU
ld works.

* src/makeint.h [!HAVE_UMASK]: Prototype for 'umask'.
(UMASK, MODE_T): Don't define.

* src/misc.c (get_tmpfile): Don't call UMASK, call umask, to
avoid compilation warning on !HAVE_UMASK platforms.
* src/output.c (output_tmpfd): Likewise.

* src/misc.c (umask) [!HAVE_UMASK]: New no-op function.

* src/config.h.W32.template (__USE_MINGW_ANSI_STDIO)
[__MINGW32__]: Define to 1, to force Make use ANSI-compatible
stdio functions, which also support the non-standard 'Id' and 'Ix'
specifiers.
(HAVE_UMASK) [__MINGW32__]: Define to 1.

* src/arscan.c (ar_member_touch): Type-cast argument of strlen to
avoid compiler warnings.