Do not install install-libcxx

Author: shahmishal

utils/build-presets.ini

@@ -397,7 +397,6 @@ 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
@@ -605,7 +604,6 @@ 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
@@ -1565,7 +1563,6 @@ libcxx
 install-llvm
 install-swift
 install-swiftsyntax
-install-libcxx
 
 # Build Playground support
 playgroundsupport
@@ -1623,7 +1620,6 @@ install-llbuild
 install-swiftpm
 install-swift-driver
 install-swiftsyntax
-install-libcxx
 install-swiftdocc
 
 # Build the stress tester
@@ -1706,7 +1702,6 @@ install-swift
 install-llbuild
 install-swiftpm
 install-swiftsyntax
-install-libcxx
 
 skip-test-swift