Make sure that during runtime we'll use the same libgfortran as during linking

https://bugs.gentoo.org/show_bug.cgi?id=419991
https://bugs.gentoo.org/show_bug.cgi?id=419895

--- a/fortran/src/Makefile.am
+++ b/fortran/src/Makefile.am
@@ -181,6 +181,7 @@
 else
   H5test_kind_SOURCES = $(srcdir)/H5test_kind.f90
 endif
+H5test_kind_LDFLAGS=-static-libgfortran
 
 # Mark this directory as part of the Fortran API
 FORTRAN_API=yes