Rename py-objfile-script-gdb.py.in to py-objfile-script-gdb.py

Rename py-objfile-script-gdb.py.in to py-objfile-script-gdb.py

Patch <https://sourceware.org/ml/gdb-patches/2011-07/msg00225.html> was
to fix the problem that py-objfile-script-gdb.py is removed after an
in-tree build and test.  As a result of the previous patch (we don't
remove files copied to host any more), this patch is no longer needed.
This patch is to revert it logically.

gdb/testsuite:

2014-10-20  Yao Qi  <yao@codesourcery.com>

	* gdb.python/py-objfile-script-gdb.py.in: Rename it to ...
	* gdb.python/py-objfile-script-gdb.py: New file.
	* gdb.python/py-objfile-script.exp: Update reference to
	py-objfile-script-gdb.py.in.  Use gdb_remote_donwload instead
	of remote_download.  Remove the dest file.