[patch,libgomp] Make libgomp Fortran modules multilib-aware

[FX]

The attached patch allows libgomp to install its Fortran modules in the correct multilib-aware directories, just like libgfortran does.
Without it, multilib Fortran OpenMP code using the modules fails to compile because the modules are not found:

$ gfortran -fopenmp a.f90 
$ gfortran -fopenmp a.f90 -m32
a.f90:1:6:

   use omp_lib
      1
Fatal Error: Can't open module file ‘omp_lib.mod’ for reading at (1): No such file or directory
compilation terminated.



Bootstrapped and tested on x86_64-apple-darwin15. OK to commit?

FX






2016-05-03  Francois-Xavier Coudert  <fxcoudert@gcc.gnu.org>

	PR libgomp/60670
	* Makefile.am: Make fincludedir multilib-aware.
	* Makefile.in: Regenerate.

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