gitignore: Ignore clang build artifacts

When using language server support from clang, the .cache directory is
added. Also for getting lsp working properly the compile_commands.json
file has to present (which is just a link to Meson generared json file).

Signed-off-by: Daniel Wagner <[email protected]>

Author: dwsuse

.gitignore

@@ -8,8 +8,10 @@ a.out
 *.so.*
 *.tar.gz
 cscope.*
+compile_commands.json
 
 .build
+.cache
 
 subprojects/*
 !subprojects/*.wrap