[binutils-gdb] Update and add .gitignore's

[sergiodj+buildbot at sergiodj dot net]

*** TEST RESULTS FOR COMMIT 74172ecf37e5877085c5d01f335db94e8091ba97 ***

Author: Simon Marchi <simon.marchi@ericsson.com>
Branch: master
Commit: 74172ecf37e5877085c5d01f335db94e8091ba97

Update and add .gitignore's

This patch adds a bunch of generated files to gdb's gitignore files.
There are still a bunch of "stamp" files that are not ignored, but I
think the rule for them should be put in the top-level gitignore.

Users and developers are encouraged to build out-of-tree, but some
people prefer the simplicity to build in-tree, so it should be useful
for them.

gdb/ChangeLog:

	* .gitignore: Ignore more files.
	* data-directory/.gitignore: Likewise.

gdb/doc/ChangeLog:

	* .gitignore: New file.

gdb/gdbserver/ChangeLog:

	* .gitinore: Ignore more files.

gdb/testsuite/ChangeLog:

	* .gitignore: New file.