gcc-cross-canadian: do not create symlinks to non-existent binaries

If fortran is not built, soft links to gfortran and g77 are created
even though the fortran compiler doesn't exist...

[YOCTO #4023]

(From OE-Core rev: c5c135bc5e71a6f9b14f249358bf5d217050ee55)

Signed-off-by: Laurentiu Palcu <laurentiu.palcu@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-devtools/gcc/gcc-package-sdk.inc

@@ -60,6 +60,10 @@ do_install () {
 	dest=${D}${libexecdir}/gcc/${TARGET_SYS}/${BINV}/
 	install -d $dest
 	for t in ar as ld nm objcopy objdump ranlib strip g77 gcc cpp gfortran; do
+		if [ "$t" = "g77" -o "$t" = "gfortran" ] && [ ! -e ${D}${bindir}/${TARGET_PREFIX}$t ]; then
+			continue
+		fi
+
 		ln -sf ${bindir}/${TARGET_PREFIX}$t $dest$t
 	done