flang in eccodes (so hacky)

ShellB3/shallbethree.sh

@@ -3511,9 +3511,13 @@ PATCH
 mk_eccodes() {
   resume_tracker && return 0
 
+  isDarwin && isTrue USING_FLANG && _tmpenvset FC "${FC} -L${BASE}/lib -lflang -lflangrti -lpgmath"
+  
   _cmake_make_install eccodes src/experimental/eccodes-${ECCODESVER}.tar.gz eccodes-${ECCODESVER} \
       -DCMAKE_C_FLAGS="${CFLAGS}" –DENABLE_PYTHON "$@"
 
+  isDarwin && isTrue USING_FLANG && _tmpenvres FC
+
   set -x
   isDarwin && for f in lib/libeccodes*.dylib bin/* $(find Library lib* -name *grib*.so) ; do \
       if isMachoNoStub "$f" ; then \