build/meson: guard many features for parserless builds

skips building: qjs/qjsc cli, examples, tests, codegen

Author: mochaaP

meson.build

@@ -259,6 +259,10 @@ import('pkgconfig').generate(
   variables: qjs_export_variables,
 )
 
+if not qjs_parser
+  subdir_done()
+endif
+
 # QuickJS bytecode compiler
 qjsc_srcs = files(
   'qjsc.c',