Switch to new download format and update source.sh script

pkg.info

@@ -1,20 +1,38 @@
 name: gcc
 description: The GNU C Compiler
 version: 15.2.0
-revision: 3
+revision: 4
 url: https://gcc.gnu.org/
 license: GPL3-or-later,LGPL3-or-later,GPL3 with GCC-exception
 architecture: any
-make_depends: ["python3","dejagnu","expect","inetutils","tcl"]
 type: source
+make_depends:
+  - python3
+  - dejagnu
+  - expect
+  - inetutils
+  - tcl
+downloads:
+  - url: https://ftpmirror.gnu.org/gcc/gcc-${BPM_PKG_VERSION}/gcc-${BPM_PKG_VERSION}.tar.xz
+    extract_to: ${BPM_SOURCE}
+    extract_strip_components: 1
+    checksum: 438fd996826b0c82485a29da03a72d71d6e3541a83ec702df4271f6fe025d24e
 split_packages:
   - name: gcc
     license: GPL3-or-later,LGPL3-or-later
-    depends: ["binutils","gcc-libs","mpc","zstd"]
+    depends:
+      - binutils
+      - gcc-libs
+      - mpc
+      - zstd
   - name: gcc-fortran
-    description: "Fortran compiler from GCC"
-    depends: ["gcc"]
+    description: Fortran compiler from GCC
+    depends:
+      - gcc
   - name: gcc-libs
     description: GCC runtime libraries
     license: GPL3 with GCC-exception
-    depends: ["glibc"]
+    depends:
+      - glibc
+    options:
+      - nostrip