tools/patchelf: fix portability issue breaking mac os x builds (#18998)

Signed-off-by: Felix Fietkau <nbd@openwrt.org>

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@44493 3c298f89-4303-0410-b956-a3cf2f4a3e73

tools/patchelf/patches/100-portability.patch

+--- a/configure.ac
++++ b/configure.ac
+@@ -1,4 +1,4 @@
+-AC_INIT([patchelf], m4_esyscmd([echo -n $(cat ./version)]))
++AC_INIT([patchelf], m4_esyscmd([printf $(cat ./version)]))
+ AC_CONFIG_SRCDIR([src/patchelf.cc])
+ AC_CONFIG_AUX_DIR([build-aux])
+ AM_INIT_AUTOMAKE([-Wall -Werror dist-bzip2 foreign color-tests parallel-tests])