gnutls: install libgnutls.so

Resolves #1162

Signed-off-by: Nikos Mavrogiannopoulos <nmav@gnutls.org>

libs/gnutls/Makefile

@@ -180,6 +180,9 @@ TARGET_CFLAGS += $(FPIC)
 
 define Build/InstallDev
 	$(INSTALL_DIR) $(1)/usr/include $(1)/usr/lib/pkgconfig
+	$(CP) \
+		$(PKG_INSTALL_DIR)/usr/lib/libgnutls.so* \
+		$(1)/usr/lib/
 	$(CP) \
 		$(PKG_INSTALL_DIR)/usr/include/gnutls \
 		$(1)/usr/include/