cmake: Make static VC runtime libraries consistent

Makes Visual C runtime libraries consistent across
Debug/MinSizeRel/Release/RelWithDebInfo, rather than just changing those
flags for RelWithDebInfo.  Also adds /Zl for statically linked
libraries.

Closes obsproject/obs-studio#1421

UI/win-update/updater/CMakeLists.txt

@@ -32,7 +32,7 @@ set(updater_SOURCES
 
 add_definitions(-DNOMINMAX -DUNICODE -D_UNICODE)
 if(MSVC)
-	add_compile_options("$<$<CONFIG:RelWithDebInfo>:/MT>")
+	add_compile_options($<IF:$<CONFIG:Debug>,/MTd,/MT>)
 endif()
 
 add_executable(updater WIN32