Add NOEXEC_SEAL and EXEC to MemfdFlags #3729

Job	Run time
Check (stable)	1m 21s
Check --no-default-features (nightly)	20s
Check (nightly)	1m 23s
Check nightly-only targets (nightly)	21s
Check selected Tier 3 platforms (nightly)	54s
Check (1.63)	1m 38s
Rustfmt	9s
Test rustix_use_experimental_asm (powerpc64le-linux)	1m 1s
Test (ubuntu)	46s
Test use-libc (ubuntu)	16s
Test (ubuntu-20.04)	42s
Test use-libc (i686-linux)	34s
Test (i686-linux)	58s
Test use-libc (aarch64-linux)	30s
Test (aarch64-linux)	59s
Test (powerpc64le-linux)	40s
Test use-libc (powerpc64le-linux)	26s
Test (riscv64-linux)	58s
Test use-libc (riscv64-linux)	26s
Test use-libc (arm-linux)	29s
Test (s390x-linux)	51s
Test (arm-linux)	59s
Test (ubuntu-stable)	41s
Test (i686-linux-stable)	58s
Test (aarch64-linux-stable)	58s
Test (riscv64-linux-stable)	56s
Test (s390x-linux-stable)	41s
Test (powerpc64le-linux-stable)	45s
Test (arm-linux-stable)	58s
Test (ubuntu-1.63)	56s
Test (i686-linux-1.63)	56s
Test (aarch64-linux-1.63)	58s
Test (riscv64-linux-1.63)	57s
Test (s390x-linux-1.63)	57s
Test (powerpc64le-linux-1.63)	57s
Test (arm-linux-1.63)	56s
Test (macos-latest)	5m 41s
Test (macos-11)	5m 39s
Test (windows)	42s
Test (windows-2019)	44s
Test (musl)	41s
	42m 42s

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