Revert #823, see also #830.

meson.py

@@ -17,18 +17,11 @@
 from mesonbuild import mesonmain
 import sys, os
 
-def main():
 thisfile = __file__
 if not os.path.isabs(thisfile):
     thisfile = os.path.normpath(os.path.join(os.getcwd(), thisfile))
-    if __package__ == '':
-        thisfile = os.path.dirname(thisfile)
 
 # The first argument *must* be an absolute path because
 # the user may have launched the program from a dir
 # that is not in path.
 sys.exit(mesonmain.run(thisfile, sys.argv[1:]))
-
-if __name__ == '__main__':
-    main()
-