test: print compiler vendor

This can point to issues with Gfortran pipes in Matlab

Author: scivision

test/stdout_stderr_fortran.f90

@@ -4,6 +4,8 @@ program main
 
 implicit none
 
+print '(a)', compiler_version()
+
 write(output_unit, '(a)') "stdout"
 write(error_unit, '(a)') "stderr"