ci/build.sh: CMake: use OSTYPE to determine if on macOS

OSTYPE is a built-in variable in bash and exists on all operating
systems.

diff --git a/ci/build.sh b/ci/build.sh
index 4c1129efd4bfe121e632cab38dc32dd582ad4c7a..bbd2e47acdb57de0fe907bc0f1971542d26a18b3 100755 (executable)
--- a/ci/build.sh
+++ b/ci/build.sh
@@ -33,7 +33,7 @@ if [ "${build_system}" = "cmake" ]; then
     cd ..
     if [ "${ID_LIKE}" = "debian" ]; then
         mv build/*.deb ${DIR}/os/${ARCH}/
-    elif [ "${ID}" = "Darwin" ]; then
+    elif [[ "${OSTYPE}" =~ "darwin" ]]; then
         mv build/*.zip ${DIR}/os/${ARCH}/
     elif [ "${ID}" = "msys2" ]; then
         mv build/*.zip ${DIR}/os/${ARCH}/