mpfr: changed to pass LDFLAGS through configprefix for hardcoding gmp library path at toolchain stage

base/mpfr/mpfr.conf

@@ -25,4 +25,5 @@ var_append patchfiles ' ' "$(match_source_file -p '.*\.patch')"
 if atstage toolchain; then
 	var_append extraconfopt ' ' "--with-gmp-include=$( pkgprefix -r includedir gmp )"
 	var_append extraconfopt ' ' "--with-gmp-lib=$( pkgprefix -r libdir gmp )"
+	var_append configprefix ' ' LDFLAGS="-Wl,-rpath,$( pkgprefix -r libdir gmp )"
 fi