Fix script

The script contained two problems. The first one was a typo in the shebang.
The second problem was in the grep command. If the full path includes by
chance the string "so" or "dylib" all files of the directory were found
accidentally. Requiring "so" or "dylib" to be at the end of the line fixes
the error.

scripts/checklibs.sh

-#!bin/bash
+#!/bin/bash
 # Copyright (C) 2020 GSI Helmholtzzentrum fuer Schwerionenforschung, Darmstadt
 # SPDX-License-Identifier: GPL-3.0-only
 # First commited by Florian Uhlig
@@ -13,7 +13,7 @@ LIBDIR=${2:-../lib}
 
 # find all libs
 # libraries are real files with the extensions .so and for macosx .dylib
-all_libs=$(find $LIBDIR -type f | grep -e \.dylib -e \.so)
+all_libs=$(find $LIBDIR -type f | grep -e \.dylib$ -e \.so$)
 
 tmpfile=$(mktemp)