Remove CMAKE_ARGS parameter that wasn't working.

CMAKE_ARGS isn't used when a directory is brought in via
`add_subdirectory`. Instead, variables need to be set in a block.
Additionally, the block is only needed for the
`FetchContent_MakeAvailable` call.

CMakeLists.txt

@@ -20,11 +20,12 @@ if(BUILD_TESTING)
     GIT_REPOSITORY https://github.com/google/googletest.git
     GIT_TAG f8d7d77c06936315286eb55f8de22cd23c188571 # release-1.14.0
     EXCLUDE_FROM_ALL
-    CMAKE_ARGS
-      -DBUILD_TESTING=OFF
-      -DINSTALL_GTEST=OFF
-    )
-  FetchContent_MakeAvailable(googletest)
+  )
+  block()
+    set(INSTALL_GTEST OFF) # Disable GoogleTest installation
+    set(BUILD_TESTING OFF) # Disable GoogleTest tests
+    FetchContent_MakeAvailable(googletest)
+  endblock()
 endif()
 
 add_subdirectory(src/beman/exemplar)