[Patch, Fortran] PR34079 - Fix returning of character bind(c) functions

[Tobias Burnus]

:ADDPATCH fortran:

For
  character(len=1,kind=c_char) FUNCTION func() bind(c)

the C equivalent is:
  char func(void)

However, gfortran was passing the character as reference (older dump,
still contained the char length arguments):
   bar (__result, .__result, x, _x)

This patch fixes it.

Build and regression tested on x86-64. OK for the trunk?

Tobias
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