Add quotes to patching step, in case there are spaces

Adds quotes to the patching step for span in case there are spaces in
the path causing it to fail

buildconfig/CMake/Span.cmake

@@ -9,8 +9,8 @@ FetchContent_Declare(
   span
   GIT_REPOSITORY https://github.com/tcbrindle/span.git
   GIT_TAG        08cb4bf0e06c0e36f7e2b64e488ede711a8bb5ad
-  PATCH_COMMAND     ${GIT_EXECUTABLE} reset --hard ${_tag}
-    COMMAND ${GIT_EXECUTABLE} apply ${_apply_flags} ${CMAKE_SOURCE_DIR}/buildconfig/CMake/span_disable_testing.patch
+  PATCH_COMMAND     "${GIT_EXECUTABLE}" reset --hard ${_tag}
+    COMMAND "${GIT_EXECUTABLE}" apply ${_apply_flags} "${CMAKE_SOURCE_DIR}/buildconfig/CMake/span_disable_testing.patch"
 )
 
 FetchContent_GetProperties(span)