grackle linking issues: added FCLIBS to LD_FLAGS
I was having issues linking grackle (latest) when compiling swift with gcc 8.4.0. Adding
$FCLIBS to the
configure.ac scripts for the grackle test makes the test succeed, and adding it to
AM_LD_FLAGS makes the code compile.
According to @lhausammann, another option would be to add
FCLIBS inside the variable