[Bug 208120] cmake strips necessary rpath when installing any gnu compiler from ports

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=208120

            Bug ID: 208120
           Summary: cmake strips necessary rpath when installing any gnu
                    compiler from ports
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: Individual Port(s)
          Assignee: freebsd-ports-bugs at FreeBSD.org
          Reporter: db at FreeBSD.org

Created attachment 168368
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=168368&action=edit
Fix for RPATH bug with gfortran

Cmake strips local RPATH as it installs, this also strips the needed RPATH for
gfortran and gcc (non base gcc). Symptoms in the fortran case is it tries to
use the base /lib/libgcc_s.so instead of ${LOCALBASE}/lib/gcc${_GCC_VER} This
result in a failure at run time since our base libgcc_s is not compatible with
gfortran's version.

After back and forth email/IRC discussion with groot at kde.org Adriaan came
up with this final suggested patch to cmake-modules.

N.B. The same bug using gcc g++ from ports has not been addressed here since 
they also should be using ${LOCALBASE} libgcc_s.so not base libgcc_s.so

An exp run is suggested with this change.

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