delete autotools .gitignore files

One special case, `src/util/xmlpool/.gitignore` is not entirely deleted,
as `xmlpool.pot` still gets generated (eg. by `ninja xmlpool-pot`).

Signed-off-by: Eric Engestrom <eric.engestrom@intel.com>
Reviewed-by: Dylan Baker <dylan@pnwbakers.com>

.gitignore

@@ -1,33 +1,2 @@
-*.a
-*.dll
-*.exe
-*.ilk
-*.log
-*.o
-*.obj
-*.orig
-*.os
-*.pc
-*.pdb
 *.pyc
 *.pyo
-*.rej
-*.so
-*.so.*
-*.sw[a-z]
-*.tar
-*.tar.bz2
-*.tar.gz
-*.tar.xz
-*.trs
-*.zip
-*~
-cscope*
-tags
-.scon*
-config.py
-build
-manifest.txt
-.dir-locals.el
-/src/git_sha1.h
-TAGS