fix normal h2 with gzip data #538

Job	Run time
clang-compile-with-make	3m 39s
gcc-compile-with-bazel	30m 14s
gcc-compile-with-bazel-all-options	37m 55s
gcc-compile-with-cmake	4m 28s
gcc-compile-with-cmake-all-options	8m 33s
gcc-compile-with-make	3m 58s
gcc-compile-with-make-all-options	6m 19s
clang-compile-with-bazel	19m 33s
clang-compile-with-bazel-all-options	23m 14s
clang-compile-with-cmake	3m 34s
clang-compile-with-cmake-all-options	8m 40s
clang-compile-with-make-all-options	7m 23s
clang-unittest	14m 30s
	2h 52m 0s

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