gdbm: fix ptest failure

Some of gdbm's ptest cases require gdbmtool, which is packaged into
${PN}-bin. So extend the RDEPENDS_${PN}-ptest to include the package.

(From OE-Core rev: e188a75aa882efc98b8390f43f18279c3707314a)

Signed-off-by: Chen Qi <Qi.Chen@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-support/gdbm/gdbm_1.18.bb

@@ -31,7 +31,7 @@ do_install_append () {
     ln -sf ../gdbm.h ${D}/${includedir}/gdbm/gdbm.h
 }
 
-RDEPENDS_${PN}-ptest += "diffutils"
+RDEPENDS_${PN}-ptest += "diffutils ${PN}-bin"
 
 do_compile_ptest() {
     oe_runmake -C tests buildtests