Remove some ignores from export_targets.py.

scripts/export_targets.py

@@ -69,8 +69,10 @@ for directory in os.environ['PATH'].split(os.pathsep):
 if not vs_found:
     GN_ENV['DEPOT_TOOLS_WIN_TOOLCHAIN'] = '0'
 
+if len(sys.argv) < 3:
+    sys.exit('Usage: export_targets.py OUT_DIR ROOTS...')
+
 (OUT_DIR, *ROOTS) = sys.argv[1:]
-assert len(ROOTS), 'Usage: export_targets.py OUT_DIR ROOTS...'
 for x in ROOTS:
     assert x.startswith('//:')
 
@@ -120,7 +122,7 @@ try:
     p = run_checked('gn', 'desc', '--format=json', str(OUT_DIR), '*', stdout=subprocess.PIPE,
                 env=GN_ENV, shell=(True if sys.platform == 'win32' else False))
 except subprocess.CalledProcessError:
-    sys.stderr.buffer.write(b'`gn` failed. Is depot_tools in your PATH?\n')
+    sys.stderr.buffer.write(b'"gn desc" failed. Is depot_tools in your PATH?\n')
     exit(1)
 
 # -
@@ -212,8 +214,6 @@ IGNORED_INCLUDE_PREFIXES = {
 }
 
 IGNORED_DIRECTORIES = {
-    '//third_party/glslang',
-    '//third_party/spirv-tools',
     '//third_party/SwiftShader',
     '//third_party/vulkan-headers',
     '//third_party/vulkan-loader',