Allow statically linking Flang support libraries when linking a library

diff -urN libtool-2.4.7/build-aux/ltmain.in.orig libtool-2.4.7/build-aux/ltmain.in
--- libtool-2.4.7/build-aux/ltmain.in.orig	2022-03-17 03:43:39.000000000 +0100
+++ libtool-2.4.7/build-aux/ltmain.in	2022-10-30 11:49:11.337887100 +0100
@@ -7459,6 +7459,15 @@
 			a_deplib=
 			break 2
 		      fi
+		      # Linking compiler provided static libraries into shared
+		      # libraries is allowed, but linking other static libraries is
+		      # non-portable.
+		      case $potlib in
+		        */libFortran*.$libext)
+		          func_append newdeplibs " $potlib"
+		          a_deplib=
+		          ;;
+		      esac
 		  done
 		done
 	      fi