[PATCH] gcc.c: new macro POST_LINK_SPECS to be able to add additional steps after linking

[Andris Pavenis]

One may need to execute extra steps after linking program. This is required
for example for DJGPP to run stubify.exe on file generated by linker.

The only way how to achieve was to use LINK_COMMAND_SPEC. It would be much easier
and less error prone to use new macro POST_LINK_SPEC introduced in this patch.

Andris

ChangeLog entry

2015 Nov 10 Andris Pavenis <andris.pavenis@iki.fi>

     * gcc.c: new macro POST_LINK_SPEC
     * doc/tm.texi.in: document POST_LINK_SPEC
     * doc/tm.texi: regenerate

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