remove -mbranch-protection=standard from tune args

compiling with -mbranch-protection=standard appears to cause a crash on aarch64
(at least, on my CM4); until this is further investigated, remove this from the
tune args.

Author: lhoward

classes/swift-cmake-base.bbclass

@@ -3,6 +3,8 @@ inherit cmake
 # avoid conflicts with meta-clang
 TOOLCHAIN = "gcc"
 
+TARGET_CC_ARCH:remove = "-mbranch-protection=standard"
+
 DEPENDS:append = " swift-native libgcc gcc glibc "
 
 SWIFT_TARGET_NAME = "${@oe.utils.conditional('TARGET_ARCH', 'arm', 'armv7-unknown-linux-gnueabihf', '${TARGET_ARCH}-unknown-linux-gnu', d)}"

classes/swift.bbclass

@@ -1,6 +1,8 @@
 # avoid conflicts with meta-clang
 TOOLCHAIN = "gcc"
 
+TARGET_CC_ARCH:remove = "-mbranch-protection=standard"
+
 SWIFT_BUILD_TESTS ?= "${DEBUG_BUILD}"
 
 DEPENDS += "swift-native glibc gcc libgcc swift-stdlib libdispatch swift-foundation"