Since we only care about shebang line and sane ones use plain ASCII, use an encoding that can not fail. Closes #561.

mesonbuild/scripts/meson_install.py

@@ -110,7 +110,7 @@ def run_install_script(d):
         print('Running custom install script %s' % script)
         suffix = os.path.splitext(script)[1].lower()
         if platform.system().lower() == 'windows' and suffix != '.bat':
-            first_line = open(script).readline().strip()
+            first_line = open(script, encoding='latin_1', errors='ignore').readline().strip()
             if first_line.startswith('#!'):
                 if shutil.which(first_line[2:]):
                     commands = [first_line[2:]]
@@ -118,7 +118,6 @@ def run_install_script(d):
                     commands = first_line[2:].split('#')[0].strip().split()
                     commands[0] = shutil.which(commands[0].split('/')[-1])
                     if commands[0] is None:
-                        commands
                         raise RuntimeError("Don't know how to run script %s." % script)
                 final_command = commands + [script] + i.cmd_arr[1:]
         else: