base-files: properly fix copying ld*.so with eglibc

r36107 ("base-files: sysupgrade fail with eglibc") tried to fix
sysupgrade by changing the ld-soname to what is expected, but only
fixed MIPS while breaking ARM.

The underlying issue is that the ld.so name varies widely across
different architectures for eglibc:

eglibc-2.19-r25243$ grep -r "ld-soname :=" . | awk '{ print $3 }' | sort -u
ld64.so.1
ld64.so.2
ld-linux-aarch64_be.so.1
ld-linux-aarch64.so.1
ld-linux-armhf.so.3
ld-linux-mipsn8.so.1
ld-linux.so.2
ld-linux.so.3
ld-linux-x32.so.2
ld-linux-x86-64.so.2
ld.so.1

Instead of adding each different soname to check for and copy it,
replace the awk script with a sed script to extract it properly and
drop the hardcoded so-name.

Signed-off-by: Jonas Gorski <jogo@openwrt.org>

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@43295 3c298f89-4303-0410-b956-a3cf2f4a3e73

package/base-files/files/lib/upgrade/common.sh

@@ -3,7 +3,7 @@
 RAM_ROOT=/tmp/root
 
 [ -x /usr/bin/ldd ] || ldd() { LD_TRACE_LOADED_OBJECTS=1 $*; }
-libs() { ldd $* | awk '{print $3}'; }
+libs() { ldd $* | sed -r 's/(.* => )?(.*) .*/\2/'; }
 
 install_file() { # <file> [ <file> ... ]
 	for file in "$@"; do
@@ -21,9 +21,6 @@ install_bin() { # <file> [ <symlink> ... ]
 	files=$1
 	[ -x "$src" ] && files="$src $(libs $src)"
 	install_file $files
-	[ -e /lib/ld.so.1 ] && {
-		install_file /lib/ld.so.1
-	}
 	shift
 	for link in "$@"; do {
 		dest="$RAM_ROOT/$link"