[Patch,Fortran] PR36495 - Add implicit none and -fimplicit-none to libgfortran

[Tobias Burnus]

Hi,

due to a missing "implicit none", a function return value was mistyped 
in libgomp (PR 36471). In order to prevent that the same might happen in 
libgfortran, I committed the following:

a) Add a "implicit none" to intrinsics/dprod_r8.f90
b) In configure: Build Fortran programs always with "-Werror 
-fimplicit-none"

Committed to the trunk as Rev. 136740. (Change is obvious and was 
pre-approved by Thomas in the PR.)

Tobias

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