[libgfortran, patch] Remove unused headers

[FX <fxcoudert at gmail dot com>]

The attached patch removes some unused headers from libgfortran sources. It removes 320 assert.h, 31 stdlib.h, 12 string.h, 4 errno.h, and the occasional math.h, unistd.h, and limits.h.

I have audited all files manually, checking for function calls. Patch was bootstrapped and regtested on x86_64-apple-darwin16.3.0.
OK to commit?

FX


PS: after that patch, the most often used header (not included in libgfortran.h) is stdlib.h, used in 351 out of 436 library source files. Maybe that warrants including it in libgfortran.h? (next are string.h with 129 includes and limits.h with 113)

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