devops: strip linux binaries

The `--strip-unneeded` removes all symbols needed for library
compilation as part of a `.a` static library.
([source](https://www.technovelty.org/linux/stripping-shared-libraries.html))

So these are safe to remove and they should keep our binary
debuggable. These should save us ~100Mb unzipped.

References #658

browser_patches/webkit/archive.sh

@@ -82,6 +82,7 @@ createZipForLinux() {
 
   # tar resulting directory and cleanup TMP.
   cd $tmpdir
+  strip --strip-unneeded * || true
   zip --symlinks -r $ZIP_PATH ./
   cd -
   rm -rf $tmpdir