rpm: Ensure macros file doesn't reference HOSTTOOLS

Currently the file encodes full paths to various host tools in the
HOSTTOOLS directory which is bad in native and target cases. We can
simply use the versions from PATH quite safely in OE.

(From OE-Core rev: be901200d94beaa35e1d05eb502b117b3b523609)

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-devtools/rpm/rpm_git.bb

@@ -128,6 +128,10 @@ do_install_append_class-target() {
     rm -rf ${D}/var
 }
 
+do_install_append () {
+	sed -i -e 's:${HOSTTOOLS_DIR}/::g' ${D}/${libdir}/rpm/macros
+}
+
 FILES_${PN} += "${libdir}/rpm-plugins/*.so \
                "