Add Foundation patch #70

Job	Run time
Build Swift for Buildroot (riscv64) (nezha)	47s
Build Swift for Buildroot (riscv64) (nezha)	42s
Build Swift for Buildroot (imx6slevk)	1m 39s
Build Swift for Buildroot (imx6slevk)	1m 34s
Build Swift for Buildroot (aarch64_efi)	1m 36s
Build Swift for Buildroot (aarch64_efi)	1m 35s
Build Swift for Buildroot (pc_x86_64_efi)	1m 37s
Build Swift for Buildroot (pc_x86_64_efi)	1m 35s
Build Swift for Buildroot (qemu_x86)	1m 37s
Build Swift for Buildroot (qemu_x86)	1m 36s
Build Swift for Buildroot (olimex_imx233_olinuxino)	1m 37s
Build Swift for Buildroot (olimex_imx233_olinuxino)	1m 38s
Build Swift for Buildroot (raspberrypi0w)	1m 38s
Build Swift for Buildroot (raspberrypi0w)	1m 32s
Build Swift for Buildroot (qemu_ppc64le_pseries)	1m 28s
Build Swift for Buildroot (qemu_ppc64le_pseries)	1m 27s
	23m 38s

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