Further binary releases fixes

* .tar -> .tar.gz: save a few more MB in distribution.
* drop android armv7 without NEON support: there should be almost no devices around that do not support this.

closes https://github.com/official-stockfish/Stockfish/pull/6850

No functional change

.github/ci/macos_matrix.json

@@ -8,7 +8,7 @@
         "compiler": "clang++",
         "comp": "clang",
         "shell": "bash",
-        "archive_ext": "tar"
+        "archive_ext": "tar.gz"
       },
       "binaries": "x86-64-bmi2"
     },
@@ -20,9 +20,9 @@
         "compiler": "clang++",
         "comp": "clang",
         "shell": "bash",
-        "archive_ext": "tar"
+        "archive_ext": "tar.gz"
       },
       "binaries": "apple-silicon"
     }
   ]
-}
+}