eglibc: fix evacuate_scripts for external toolchains

Not every external toolchain has mtrace/sotruss/xtrace scripts so check
their existance first.

(From OE-Core rev: 06ea50973a4446053d1ecac5b8e4cf425c8df5b1)

Signed-off-by: Marcin Juszkiewicz <marcin.juszkiewicz@linaro.org>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-core/eglibc/eglibc-package.inc

@@ -117,7 +117,9 @@ do_evacuate_scripts () {
 	target=${D}${includedir}/eglibc-scripts-internal-${MULTIMACH_TARGET_SYS}
 	mkdir -p $target
 	for i in ${bashscripts}; do
-		cp ${D}${bindir}/$i $target/
+		if [ -f ${D}${bindir}/$i ]; then
+			cp ${D}${bindir}/$i $target/
+		fi
 	done
 }