Do not install install-libcxx

(cherry picked from commit 128e21a)

Author: shahmishal

utils/build-presets.ini

@@ -394,7 +394,6 @@ install-llbuild
 install-swiftpm
 install-swift-driver
 install-swiftsyntax
-install-libcxx
 
 [preset: buildbot_incremental,tools=RA,stdlib=RA,apple_silicon]
 mixin-preset=buildbot_incremental,tools=RA,stdlib=RA
@@ -644,7 +643,6 @@ install-llbuild
 install-swiftpm
 install-swiftsyntax
 install-swift-driver
-install-libcxx
 
 # We need to build the unittest extras so we can test
 build-swift-stdlib-unittest-extra
@@ -1603,7 +1601,6 @@ libcxx
 install-llvm
 install-swift
 install-swiftsyntax
-install-libcxx
 
 # Build Playground support
 playgroundsupport
@@ -1661,7 +1658,6 @@ install-llbuild
 install-swiftpm
 install-swift-driver
 install-swiftsyntax
-install-libcxx
 install-swiftdocc
 
 # Build the stress tester and SwiftEvolve
@@ -1745,7 +1741,6 @@ install-swift
 install-llbuild
 install-swiftpm
 install-swiftsyntax
-install-libcxx
 
 skip-test-swift
 skip-test-cmark