[build-script] Disable building and installing the Foundation macros for standalone SDKs (swiftlang#78782)

Also, remove CMake flag for Android that is now directly set in that repo.

Author: finagolfin

utils/build-script-impl

@@ -2409,6 +2409,11 @@ for host in "${ALL_HOSTS[@]}"; do
                     continue
                 fi
 
+                if [[ "${BUILD_SWIFT_TOOLS}" == "0" ]]; then
+                    echo "Skipping building Foundation Macros for ${host}, because the host tools are not being built"
+                    continue
+                fi
+
                 if [[ "${SKIP_CLEAN_FOUNDATION}" == "0" ]]
                 then
                   # The Swift project might have been changed, but CMake might
@@ -2558,11 +2563,6 @@ for host in "${ALL_HOSTS[@]}"; do
                         -DCMAKE_FIND_ROOT_PATH:PATH="${CROSS_COMPILE_DEPS_PATH}"
                     )
                 fi
-                if [[ "${host}" == "android-"* ]]; then
-                    cmake_options+=(
-                        -DCMAKE_HAVE_LIBC_PTHREAD=True
-                    )
-                fi
                 ;;
             libdispatch|libdispatch_static)
                 LIBDISPATCH_BUILD_DIR=$(build_directory ${host} ${product})
@@ -3009,6 +3009,11 @@ for host in "${ALL_HOSTS[@]}"; do
                     continue
                 fi
 
+                if [[ "${BUILD_SWIFT_TOOLS}" == "0" && "${product}" == "foundation_macros" ]]; then
+                    echo "Skipping installing Foundation Macros for ${host}, because the host tools are not being built"
+                    continue
+                fi
+
                 if [[ -z "${INSTALL_FOUNDATION}" ]] ; then
                     continue
                 fi