[gdb/testsuite] Fix whitespace issues

This is the result of:
...
$ git rm -rf gdb/testsuite
$ git commit -a -m tmp
$ git revert HEAD
$ git rebase --whitespace=fix HEAD^
...

Tested on x86_64-linux.

PR build/33616
Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=33616
755 files changed