avahi: Fix pkgconfig files to be cross compile friendly

libdir should not point to the host.

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

libs/avahi/Makefile

@@ -9,7 +9,7 @@ include $(TOPDIR)/rules.mk
 
 PKG_NAME:=avahi
 PKG_VERSION:=0.7
-PKG_RELEASE:=3
+PKG_RELEASE:=4
 
 PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.gz
 PKG_SOURCE_URL:=https://github.com/lathiat/avahi/releases/download/v$(PKG_VERSION) \
@@ -327,7 +327,14 @@ ifeq ($(BUILD_VARIANT),dbus)
 endif
 endif
 	$(INSTALL_DIR) $(1)/usr/lib/pkgconfig
-	$(CP) $(PKG_INSTALL_DIR)/usr/lib/pkgconfig/* $(1)/usr/lib/pkgconfig/
+	$(INSTALL_DATA) $(PKG_INSTALL_DIR)/usr/lib/pkgconfig/* $(1)/usr/lib/pkgconfig/
+	$(SED) 's,/usr/lib,$$$${exec_prefix}/lib,g' $(1)/usr/lib/pkgconfig/avahi-core.pc
+ifneq ($(CONFIG_PACKAGE_libavahi-compat-libdnssd),)
+ifeq ($(BUILD_VARIANT),dbus)
+	$(SED) 's,/usr/lib,$$$${exec_prefix}/lib,g' $(1)/usr/lib/pkgconfig/avahi-client.pc
+	$(SED) 's,/usr/lib,$$$${exec_prefix}/lib,g' $(1)/usr/lib/pkgconfig/avahi-compat-libdns_sd.pc
+endif
+endif
 endef
 
 define Package/libavahi/install