kbuild: ver_linux fix glibc version print

Fix ver_linux glibc version printing (for real this time)

Alexey Dobriyan reported that commit
4a645d5ea65baaa5736bcb566673bf4a351b2ad8
broke ver_linux when glibc has a 3 digit
version number, and proposed a patch.
Al Viro then suggested a simpler way to
solve the problem which I've then simply
put into patch form.

Signed-off-by: Alexey Dobriyan <adobriyan@sw.ru>
Signed-off-by: Al Viro <viro@ftp.linux.org.uk>
Signed-off-by: Jesper Juhl <jesper.juhl@gmail.com>
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>

scripts/ver_linux

@@ -65,9 +65,8 @@ isdnctrl 2>&1 | grep version | awk \
 showmount --version 2>&1 | grep nfs-utils | awk \
 'NR==1{print "nfs-utils             ", $NF}'
 
-ls -l `ldd /bin/sh | awk '/libc/{print $3}'` | sed \
--e 's/\.so$//' | sed -e 's/>//' | \
-awk -F'[.-]' '{print "Linux C Library        "$(NF-1)"."$NF}'
+echo -n "Linux C Library        "
+sed -n -e '/^.*\/libc-\([^/]*\)\.so$/{s//\1/;p;q}' < /proc/self/maps
 
 ldd -v > /dev/null 2>&1 && ldd -v || ldd --version |head -n 1 | awk \
 'NR==1{print "Dynamic linker (ldd)  ", $NF}'