Mac fixes (#1776)

* macOS build fixes (#1773)

* macOS build fixes

Add missing headers
Threads_Pthreads: do not call pthread_setname_np() on macOS as it does not do
the same as on Linux
DebugStr() -> os_log()

* Make the project build with Makefiles on macOS

* Fix getting modifier key state on Mac (#1774)

We really need to clean up all Carbon calls here (many will go away when the
project switches to SDL2 for all platforms)

* Fix Xcode build; bump minimum version of macOS (#1775)

* Build fixes for the "Unix Makefiles" generator
Pass CMAKE_BUILD_TYPE to the external projects
* Fix indent

extern/CMakeProject-cppformat.cmake

@@ -0,0 +1,39 @@
+if (NOT IS_DIRECTORY "${SM_EXTERN_DIR}/cppformat")
+  message(ERROR "Submodule for cppformat missing. Run git submodule init && git submodule update first.")
+  return()
+endif()
+
+list(APPEND CPPFORMAT_SRC
+  "cppformat/fmt/format.cc"
+)
+
+list(APPEND CPPFORMAT_HPP
+  "cppformat/fmt/format.h"
+)
+
+source_group("" FILES ${CPPFORMAT_SRC} ${CPPFORMAT_HPP})
+
+add_library("cppformat" ${CPPFORMAT_SRC} ${CPPFORMAT_HPP})
+
+set_property(TARGET "cppformat" PROPERTY FOLDER "External Libraries")
+
+disable_project_warnings("cppformat")
+
+target_include_directories("cppformat" PUBLIC "cppformat")
+
+if (MSVC)
+  sm_add_compile_definition("cppformat" _CRT_SECURE_NO_WARNINGS)
+elseif(APPLE)
+  set_target_properties("cppformat" PROPERTIES
+    XCODE_ATTRIBUTE_CLANG_CXX_LANGUAGE_STANDARD "${SM_CPP_STANDARD}"
+    XCODE_ATTRIBUTE_CLANG_CXX_LIBRARY "libc++"
+  )
+  sm_add_compile_flag("cppformat" "-std=${SM_CPP_STANDARD}")
+  sm_add_compile_flag("cppformat" "-stdlib=libc++")
+else() # Unix
+  sm_add_compile_flag("cppformat" "-std=${SM_CPP_STANDARD}")
+  if (CMAKE_CXX_COMPILER MATCHES "clang")
+    sm_add_compile_flag("cppformat" "-stdlib=libc++")
+  endif()
+endif()
+