[gfortran,patch] add -fbackslash

[FX Coudert]

This patch adds -fbackslash/-fno-backslash flags, for compatibility with 
g77 (and many other compilers). Two testcases to go with, and the ChangeLog.

Don't know what more I can say. The core of the patch is really trivial, 
so I hope some can approve this one quickly.

Regtested on i686-linux. OK for mainline and 4.0?
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