- correct the directory where to find glaze for testing

--- tests/CMakeLists.txt.orig	2024-01-02 19:10:49 UTC
+++ tests/CMakeLists.txt
@@ -114,7 +114,7 @@ if(CMAKE_CXX_COMPILER_ID MATCHES "GNU|Clang")
     "${CMAKE_CURRENT_SOURCE_DIR}/find_package"
     "${CMAKE_CURRENT_BINARY_DIR}/find_package"
     --build-options
-    "-Dglaze_ROOT:PATH=${CMAKE_CURRENT_BINARY_DIR}/install"
+    "-Dglaze_ROOT:PATH=${FREEBSD_STAGEDIR_PREFIX}"
     "-DCMAKE_BUILD_TYPE=${CMAKE_BUILD_TYPE}"
     "-DBUILD_TESTING=ON"
     --test-command "${CMAKE_CTEST_COMMAND}" --verbose --output-on-failure # inner ctest command