Quote CPU variable to fix shellcheck SC2086

Author: SeanTAllen

.ci-scripts/arm64-nightly.bash

@@ -60,7 +60,7 @@ ASSET_DESCRIPTION="https://github.com/ponylang/ponyc"
 
 # Build pony installation
 echo "Building ponyc installation..."
-make configure arch=${PROCESSOR} cpu=${CPU} build_flags=-j${MAKE_PARALLELISM} \
+make configure arch=${PROCESSOR} cpu="${CPU}" build_flags=-j${MAKE_PARALLELISM} \
   version="${PONY_VERSION}"
 make build version="${PONY_VERSION}"
 make install arch=${PROCESSOR} prefix="${BUILD_PREFIX}" symlink=no version="${PONY_VERSION}"

.ci-scripts/arm64-release.bash

@@ -57,7 +57,7 @@ ASSET_DESCRIPTION="https://github.com/ponylang/ponyc"
 
 # Build pony installation
 echo "Building ponyc installation..."
-make configure arch=${PROCESSOR} cpu=${CPU} build_flags=-j${MAKE_PARALLELISM}
+make configure arch=${PROCESSOR} cpu="${CPU}" build_flags=-j${MAKE_PARALLELISM}
 make build
 make install arch=${PROCESSOR} prefix="${BUILD_PREFIX}" symlink=no