Swift stdlib patches

apple/swift#41686

Swift Stdlib is cross compiling with patches in apple/swift#41686, it seems SwiftPM also needs to be patched.

coleman@macbook-linux:~/Developer/buildroot$ make swift-hello-reconfigure
rm -f /home/coleman/Developer/buildroot/output/build/swift-hello-0.1.0/.stamp_rsynced
rm -f /home/coleman/Developer/buildroot/output/build/swift-hello-0.1.0/.stamp_installed
rm -f /home/coleman/Developer/buildroot/output/build/swift-hello-0.1.0/.stamp_staging_installed
rm -f /home/coleman/Developer/buildroot/output/build/swift-hello-0.1.0/.stamp_target_installed
rm -f /home/coleman/Developer/buildroot/output/build/swift-hello-0.1.0/.stamp_images_installed
rm -f /home/coleman/Developer/buildroot/output/build/swift-hello-0.1.0/.stamp_host_installed
rm -f /home/coleman/Developer/buildroot/output/build/swift-hello-0.1.0/.stamp_built
rm -f /home/coleman/Developer/buildroot/output/build/swift-hello-0.1.0/.stamp_configured
>>> swift-hello 0.1.0 Syncing from source dir package/swift-hello//src
rsync -au --chmod=u=rwX,go=rX --exclude .svn --exclude .git --exclude .hg --exclude .bzr --exclude CVS package/swift-hello//src/ /home/coleman/Developer/buildroot/output/build/swift-hello-0.1.0
>>> swift-hello 0.1.0 Configuring
>>> swift-hello 0.1.0 Building
( cd /home/coleman/Developer/buildroot/output/build/swift-hello-0.1.0/ && rm -rf .build && PATH="/home/coleman/Developer/buildroot/output/host/bin:/home/coleman/Developer/buildroot/output/host/sbin:/home/coleman/.vscode-server/bin/f80445acd5a3dadef24aa209168452a3d97cc326/bin/remote-cli:/usr/local/bin:/usr/bin:/bin:/usr/local/games:/usr/games":/home/coleman/Developer/swift-install-armv5/usr/bin swift build -c release --destination /home/coleman/Developer/buildroot/output/host/usr/share/swift/armv5-unknown-linux-gnueabi-toolchain.json )
error: unknownArch
make: *** [package/pkg-generic.mk:292: /home/coleman/Developer/buildroot/output/build/swift-hello-0.1.0/.stamp_built] Error 1

SwiftPM patches

apple/swift-tools-support-core#296

coleman@macbook-linux:~/Developer/buildroot$ readelf -A /home/coleman/Developer/buildroot/output/target/usr/bin/hello
Attribute Section: aeabi
File Attributes
Tag_CPU_name: "5TE"
Tag_CPU_arch: v5TE
Tag_ARM_ISA_use: Yes
Tag_THUMB_ISA_use: Thumb-1
Tag_ABI_PCS_wchar_t: 4
Tag_ABI_FP_rounding: Needed
Tag_ABI_FP_denormal: Needed
Tag_ABI_FP_exceptions: Needed
Tag_ABI_FP_number_model: IEEE 754
Tag_ABI_align_needed: 8-byte
Tag_ABI_align_preserved: 8-byte, except leaf SP
Tag_ABI_enum_size: int

Patches are attached so build can be reproduced by others, until PRs are merged.

All related PRs have been merged.