Merge pull request #81143 from etcwilde/ewilde/6.2-bootstrap-install-dispatch

[6.2🍒] Bootstrap: Install dispatch in stage0

Explanation:
Concurrency depends on corelibs-libdispatch. It builds part of corelibs libdispatch as part of the concurrency build but does not install it so installing the compiler that uses concurrency fails to launch because libdispatch isn't found. Build and install corelibs libdispatch as part of the stage0 toolchain build.
Scope: This only impacts bootstrap builds and has no impact on Apple platforms.
Risk: Low. The bootstrap build is only used for bringing up the compiler in new environments, not on Apple platforms.
Reviewers: @MaxDesiatov
Testing: Local testing. This patch fixed the same issue on the main branch.
Fixes: rdar://150159526

Author: etcwilde

utils/build-presets.ini

@@ -3127,6 +3127,7 @@ swift-include-tests=0
 llvm-include-tests=0
 
 release
+libdispatch
 
 skip-early-swiftsyntax
 skip-early-swift-driver
@@ -3159,6 +3160,7 @@ llvm-install-components=llvm-ar;llvm-ranlib;clang;clang-resource-headers;compile
 
 install-llvm
 install-swift
+install-libdispatch
 
 # Build Toolchain Requirements:
 # - C/C++ compiler