lzo: fix pkgconfig paths

The last commit to this package that added the pkgconfig file did not
fix the paths to point to the prefix.

This allows packages to find lzo properly.

Signed-off-by: Rosen Penev <rosenp@gmail.com>

package/libs/lzo/Makefile

@@ -9,7 +9,7 @@ include $(TOPDIR)/rules.mk
 
 PKG_NAME:=lzo
 PKG_VERSION:=2.10
-PKG_RELEASE:=3
+PKG_RELEASE:=4
 
 PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.gz
 PKG_SOURCE_URL:=http://www.oberhumer.com/opensource/lzo/download/
@@ -49,6 +49,8 @@ define Build/InstallDev
 	$(CP) $(PKG_INSTALL_DIR)/usr/include/lzo $(1)/usr/include/
 	$(CP) $(PKG_INSTALL_DIR)/usr/lib/liblzo2.{a,so*} $(1)/usr/lib/
 	$(CP) $(PKG_INSTALL_DIR)/usr/lib/pkgconfig/lzo2.pc $(1)/usr/lib/pkgconfig
+	$(SED) 's,/usr/include,$$$${prefix}/include,g' $(1)/usr/lib/pkgconfig/lzo2.pc
+	$(SED) 's,/usr/lib,$$$${exec_prefix}/lib,g' $(1)/usr/lib/pkgconfig/lzo2.pc
 endef
 
 define Package/liblzo/install