Hi, Automakers!

  Another patch from my side. This one makes it possible for users to 
pass additional options to libtool in 'compile' mode. Fixes #54020.

  Added documentation and a test case including the '-no-suppress' 
option. All tests with 'lt' or 'libtool' in the name pass.

  Feel free to rename the variables, I just came up with the names 
LTCOMPILE_PREFLAGS and LTCOMPILE_POSTFLAGS, reflecting the positions 
where the variables are put and the mode they're used in.

-- 
Regards - Bogdan ('bogdro') D.                 (GNU/Linux & FreeDOS)
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