gitignore: remove all files

Since we're now building out of source by default.

Signed-off-by: Julien Danjou <julien@danjou.info>

.gitignore

@@ -1,36 +1,5 @@
 .tags
 .version_stamp
 .*.sw?
-*.luac
-*.o
-awesome
-awesome-client
-doc
-config.h
-CMakeCache.txt
-CMakeFiles/
-CPackConfig.cmake
-CPackSourceConfig.cmake
-cmake_install.cmake
-install_manifest.txt
-awesome.doxygen
-awesome.1
-awesome.1.xml
-awesome.1.gz
-awesome-client.1
-awesome-client.1.xml
-awesome-client.1.gz
-awesomerc.5
-awesomerc.5.xml
-awesomerc.5.gz
-awesomerc.lua
-widgetgen.h
-layoutgen.h
-awesome-version-internal.h
-apidocgen.txt
-common/tokenize.[hc]
-common/atoms-*.h
-luadoc
-lib/capi.lua
 build
 .build*