gm self-test: stop checking stdout and stderr

gm/tests/outputs/no-readpath/output-expected/stdout

Index: gm/tests/outputs/no-readpath/output-expected/stdout
diff --git a/gm/tests/outputs/no-readpath/output-expected/stdout b/gm/tests/outputs/no-readpath/output-expected/stdout
deleted file mode 100644
index ec10ea9d1f47835ba1ef6a2ddb77faa961894623..0000000000000000000000000000000000000000
--- a/gm/tests/outputs/no-readpath/output-expected/stdout
+++ /dev/null
@@ -1,19 +0,0 @@
-GM: These configs will be run: 8888 565
-GM: writing to gm/tests/outputs/no-readpath/output-actual/writePath
-GM: writing mismatches to gm/tests/outputs/no-readpath/output-actual/mismatchPath
-GM: writing images without expectations to gm/tests/outputs/no-readpath/output-actual/missingExpectationsPath
-GM: reading resources from resources
-GM: drawing... selftest1 [300 200]
-GM: Ran 1 GMs
-GM: ... over  2 configs ["8888", "565"]
-GM: ...  and  1 modes   [""]
-GM: ... so there should be a total of 2 tests.
-GM: Ran 2 tests: NoGpuContext=0 IntentionallySkipped=0 RenderModeMismatch=0 GeneratePdfFailed=0 ExpectationsMismatch=0 MissingExpectations=2 WritingReferenceImage=0
-GM: [*] 0 NoGpuContext:
-GM: [ ] 0 IntentionallySkipped:
-GM: [*] 0 RenderModeMismatch:
-GM: [*] 0 GeneratePdfFailed:
-GM: [*] 0 ExpectationsMismatch:
-GM: [ ] 2 MissingExpectations: 8888/selftest1 565/selftest1
-GM: [*] 0 WritingReferenceImage:
-GM: (results marked with [*] will cause nonzero return value)