Switch to new download format, update source.sh script and add patch

pkg.info

@@ -1,9 +1,11 @@
 name: docbook-xsl-nons
 description: Docbook XSL modular stylesheet
 version: 1.79.2
-revision: 3
+revision: 4
 url: https://docbook.org/
 license: LicenseRef-docbook-XSL
+maintainers:
+  - [email protected]
 architecture: any
 output_architecture: any
 type: source
@@ -11,3 +13,8 @@ depends:
   - docbook-xml
   - libxml2
   - libxslt
+downloads:
+  - url: https://github.com/docbook/xslt10-stylesheets/releases/download/release/${BPM_PKG_VERSION}/docbook-xsl-nons-${BPM_PKG_VERSION}.tar.gz
+    extract_to: ${BPM_SOURCE}
+    extract_strip_components: 1
+    checksum: f89425b44e48aad24319a2f0d38e0cb6059fdc7dbaf31787c8346c748175ca8e