A build script in glusterfs uses /bin/bash interpreter and fails to get
the version from the VERSION file at build time:
sh: build-aux/pkg-version: /bin/bash: bad interpreter: No such file or directory
sh: build-aux/pkg-version: /bin/bash: bad interpreter: No such file or directory
sh: build-aux/pkg-version: /bin/bash: bad interpreter: No such file or directory
[...]
The result is that `gluster --version` doesn't include a version number.
Fixup the shebang to get the version info.