[patch,4.4, Fortran] PR34997 - Better error message for '$' in name

[Tobias Burnus]

Currently, gfortran returns simply MATCH_ERROR in gfc_match_name if a 
symbol contains a $ sign. This gives quite unclear error messages:

Error: Syntax error in data declaration at (1)
Error: Expected = sign in PARAMETER statement at (1)
Error: Syntax error in common block name at (1)

The attached patch changes the message to:

Error: Invalid character '$' at (1). Use -fdollar-ok to accept it

which is clearer and points to the -fdollar-ok flag, which is hard to 
find otherwise. (Well, I did not find it ;-)

Bootstrapped and regtested (-m32/-m64, gfortran+gomp) on x86-64-linux.
OK for the trunk?

Tobias
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