[gfortran,patch] Complete libgfortran namespace separation and version number

[François-Xavier Coudert]

:ADDPATCH fortran:

Attached patch does the following three things:
  - add an undocumented -fallow-leading-underscore option to gfortran,
for internal use only, until the ISO_C_BINDING patch is commited, that
allows symbol names to begin with an underscore (note: it does
explicitely ICE if one of these variables has implicit type)
  - use this to prefix all libgfortran symbols names with _gfortran_
(this was not the case before, especially for specifics), achieving
complete namespace separation for the library
  - bump the libgfortran version number to 4.3.0

Bootstrapped & regtested on i686-linux. OK for mainline?

FX
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