glibc-scripts: add RDEPENDS on libsotruss package required by sotruss script

It solves below error observed on qemux86 target:
root@qemux86:~# sotruss ./hello
ERROR: ld.so: object '/usr/$LIB/audit/sotruss-lib.so' cannot be loaded as audit
interface: cannot open shared object file; ignored.
Hello World
root@qemux86:~#

With this change, we get:
root@qemux86:~# sotruss ./hello
          hello -> libc.so.6      :*__libc_start_main(0x8048300, 0x1,
0xbfc86274)
          hello -> libc.so.6      :*puts(0x804851c, 0xb74af000, 0x0)
Hello World
root@qemux86:~#

(From OE-Core rev: aa2d2161c5b41358f732e95199f0c066d4e2d77a)

Signed-off-by: Jagadeesh Krishnanjanappa <jkrishnanjanappa@mvista.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-core/glibc/glibc-scripts.inc

@@ -14,3 +14,7 @@ do_install() {
 		install -m 0755 ${SRC}/$i ${D}${bindir}/
 	done
 }
+
+# sotruss script requires sotruss-lib.so (given by libsotruss package), 
+# to produce trace of the library calls.
+RDEPENDS_${PN} += "libsotruss"