I've divided and improved the patch.
Issue 4374 / 1: Fix platform identification
On Cygwin environment,
Guile's uname returns the strings of "CYGWIN_NT-6.3" etc.
It contains unnecessary strings for the platform identification,
such as Windows version.
Therefore, to remove them to return the only "cygwin".
Issue 4374 / 2: Add make-tmpfile procedure
Procedure "make-tmpfile" is
to create a unique temporary file using "mkstemp!".
Issue 4374 / 3: Add copy-binary-file procedure
Procedure "copy-binary-file" is
to copy a binary file correctly on any platforms.
Issue 4374 / 4: Use mkstemp for intermediate ps files
When backend is `ps' (default),
intermediate ps files are created by mkstemp.
The following issues are fixed.
Filename issue (to compile lines.ly, gs_init.ly etc.)
Intermediate file issue (to overwrite and delete .ps file)
https://codereview.appspot.com/233230044/
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