build: remove /TP usage on MSVC

This removes the workaround for pre-VS2015 compilers which did not
support sufficient amounts of the C99 standard. As VS0213 is now no
longer supported, remove the workaround as we can expect users to be at
supported Visual Studio release (VS2019+).

CMakeLists.txt

@@ -51,9 +51,6 @@ add_compile_options($<$<CONFIG:Debug>:-DCMARK_DEBUG_NODES>)
 function(cmark_add_compile_options target)
   if(MSVC)
     target_compile_options(${target} PRIVATE /W4 /wd4706 /we4244 /we4267)
-    if(MSVC_VERSION LESS 1800)
-      target_compile_options(${target} PRIVATE /TP)
-    endif()
     target_compile_definitions(${target} PRIVATE _CRT_SECURE_NO_WARNINGS)
   else()
     target_compile_options(${target} PRIVATE