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

plugins/win-capture/get-graphics-offsets/CMakeLists.txt

@@ -12,7 +12,7 @@ set(get-graphics-offsets_SOURCES
 	d3d9-offsets.cpp)
 
 if(MSVC)
-	add_compile_options("$<$<CONFIG:RelWithDebInfo>:/MT>")
+	add_compile_options($<IF:$<CONFIG:Debug>,/MTd,/MT>)
 endif()
 
 add_executable(get-graphics-offsets

plugins/win-capture/graphics-hook/CMakeLists.txt

@@ -30,7 +30,7 @@ set(graphics-hook_SOURCES
 	d3d12-capture.cpp)
 
 if(MSVC)
-	add_compile_options("$<$<CONFIG:RelWithDebInfo>:/MT>")
+	add_compile_options("$<IF:$<CONFIG:Debug>,/MTd,/MT>")
 endif()
 
 add_library(graphics-hook MODULE

plugins/win-capture/inject-helper/CMakeLists.txt

@@ -10,7 +10,7 @@ set(inject-helper_SOURCES
 	inject-helper.c)
 
 if(MSVC)
-	add_compile_options("$<$<CONFIG:RelWithDebInfo>:/MT>")
+	add_compile_options($<IF:$<CONFIG:Debug>,/MTd,/MT>)
 endif()
 
 add_executable(inject-helper