gitignore: Clean up for meson

Change-Id: I4a1619ae0979c338a5f339dba9f127dd1b88aebe
Signed-off-by: William A. Kennington III <wak@google.com>
diff --git a/.gitignore b/.gitignore
index fd23289..7fdf4d4 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,69 +1,2 @@
-# Template from:
-# https://github.com/github/gitignore/blob/master/Autotools.gitignore
-
-# http://www.gnu.org/software/automake
-
-Makefile.in
-/ar-lib
-/mdate-sh
-/py-compile
-/test-driver
-/ylwrap
-
-# http://www.gnu.org/software/autoconf
-
-/autom4te.cache
-/autoscan.log
-/autoscan-*.log
-/aclocal.m4
-/compile
-/config.guess
-/config.h.in
-/config.sub
-/configure
-/configure.scan
-/depcomp
-/install-sh
-/missing
-/stamp-h1
-/m4
-
-# https://www.gnu.org/software/libtool/
-
-/ltmain.sh
-
-# http://www.gnu.org/software/texinfo
-
-/texinfo.tex
-
-# Repo Specific Items
-*.o
-*.lo
-/config.h
-/config.h.in~
-/config.log
-/config.status
-Makefile
-.deps
-.dirstamp
-/lib*
-.libs/
-/*-libtool
-.project
-/test/*_unittest
-/test/*.log
-/test/*.trs
-
-# ignore vim swap files
-.*.sw*
-# failures from patch
-*.orig
-*.rej
-# backup files from some editors
-*~
-.cscope/
-build/
-
-# protobuf generated files
-*.pb.h
-*.pb.cc
+/build*/
+/subprojects/*