elfutils: install library files for pkg-config

Support other packages using pkg-config to query existence and details of
libelf and libdw libraries at build time.

Signed-off-by: Tony Ambardar <itugrok@yahoo.com>

package/libs/elfutils/Makefile

@@ -71,6 +71,9 @@ define Build/InstallDev
 	$(CP) $(PKG_INSTALL_DIR)/usr/lib/libasm*.{a,so*} $(1)/usr/lib/
 	$(CP) $(PKG_INSTALL_DIR)/usr/lib/libdw*.{a,so*} $(1)/usr/lib/
 	$(CP) $(PKG_INSTALL_DIR)/usr/lib/libelf*.{a,so*} $(1)/usr/lib/
+	$(INSTALL_DIR) $(1)/usr/lib/pkgconfig
+	$(CP) $(PKG_INSTALL_DIR)/usr/lib/pkgconfig/libelf.pc $(1)/usr/lib/pkgconfig/
+	$(CP) $(PKG_INSTALL_DIR)/usr/lib/pkgconfig/libdw.pc $(1)/usr/lib/pkgconfig/
 endef
 
 define Package/libasm/install