Update gitignore for meson

Drop all automake detritus, leave only the default build directory meson
suggests

Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>

.gitignore

@@ -1,7 +1,5 @@
 *.o
 *.pc
-*.la
-*.lo
 *.swp
 *~
 *.sig
@@ -10,43 +8,5 @@
 *.patch
 *.rej
 *.trs
-Makefile
-Makefile.in
-aclocal.m4
-autom4te.cache/
-config.guess
-config.h
-config.h.in
-config.log
-config.status
-config.sub
-configure
-depcomp
-install-sh
-libtool
-ltmain.sh
-missing
-stamp-h1
-.libs/
-.deps/
-src/libratbag-version.h
-doc/libratbag.doxygen
-doc/html
 tags
-test-driver
-compile
-m4
-symbols-leak-test.log
-test-build-cxx
-test-build-linker
-test-build-pedantic-c99
-test-build-std-gnuc90
-test-iconv-helper
-test-suite.log
-test-context
-test-device
-test-*.log
-ratbag-command
-hidpp10-dump-page
-hidpp20-dump-page
-lur-command
+build/