Use spawnl() rather than pipe() & fork() to invoke xkbcomp

Implement System() specially on Cygwin not to use fork() and exec(), but
spawnl()

Use System() and a temp file rather than pipe() & fork() to invoke xkbcomp on
cygwin, just as done on mingw

Somewhat the counsel of despair, but sometimes Windows is being such a little
bitch that the cygwin DLL just can't emulate fork() successfully, so just using
spawnl() here is more robust and means I don't have to deal with end-users
reporting this as a problem with the xserver

Popen is not used, but must be built as it is referenced by sdksyms

v2: Update to include fix to Win32TempDir() when TMP is set but TEMP isn't

XXX: Really this should check TMPDIR first, as that's the canonical UNIX way to
set the temporary directory?

v3: Fix implicit-function-declaration of Win32TempDir() in XkbDDXCompileKeymapByNames()

Add a prototype for Win32TempDir()

Signed-off-by: Jon TURNEY <jon.turney@dronecode.org.uk>

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