Merge pull request #8198 from mazes-80/system-fmt

Build system: default to fmt shared library when available

CMakeLists.txt

@@ -532,7 +532,13 @@ if (_M_X86)
   add_subdirectory(Externals/Bochs_disasm)
 endif()
 add_subdirectory(Externals/cpp-optparse)
-add_subdirectory(Externals/fmt EXCLUDE_FROM_ALL)
+find_package(fmt 6.0)
+if(fmt_FOUND)
+  message(STATUS "Using shared fmt ${fmt_VERSION}")
+else()
+  message(STATUS "Using static fmt from Externals")
+  add_subdirectory(Externals/fmt EXCLUDE_FROM_ALL)
+endif()
 add_subdirectory(Externals/glslang)
 add_subdirectory(Externals/imgui)