xnn_table_exp2minus_k_over_16 extern as uint32_t instead of int #1303

Job	Run time
build-and-test / cmake-linux-riscv64	8m 31s
build-and-test / cmake-linux-armhf	11m 59s
build-and-test / cmake-linux-local	13m 4s
build-and-test / cmake-linux-aarch64	10m 42s
build-and-test / cmake-linux-riscv64-rvv	10m 19s
build-and-test / cmake-windows-arm64	7m 10s
build-and-test / cmake-windows-x64	8m 38s
build-and-test / bazel-linux-aarch64	9m 49s
build-and-test / bazel-linux-x86_64	13m 9s
build-and-test / bazel-linux-x86_64-gcc-9	7m 57s
build-and-test / cmake-android (build-android-arm64.sh)	10m 5s
build-and-test / cmake-ios-arm64	5m 0s
build-and-test / cmake-ios-x86_64	6m 22s
build-and-test / cmake-android (build-android-armv7.sh)	9m 57s
build-and-test / cmake-macos-arm64	10m 54s
build-and-test / cmake-android (build-android-x86.sh)	12m 8s
build-and-test / cmake-windows-x86	9m 6s
	2h 44m 50s

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