backend/vs: Fix b_vscrt=from_buildtype for debugoptimized

The ninja backend only uses the debug C runtime for 'debug', not for
'debugoptimized'.

The ninja backend always uses the DLL C runtime for all configurations.

The documentation matches the ninja backend.

Make the visual studio backend follow the documentation (and the precedent
set by the ninja backend).

mesonbuild/backend/vs2010backend.py

@@ -821,12 +821,12 @@ class Vs2010Backend(backends.Backend):
         clconf = ET.SubElement(compiles, 'ClCompile')
         # CRT type; debug or release
         if vscrt_type.value == 'from_buildtype':
-            if self.buildtype == 'debug' or self.buildtype == 'debugoptimized':
+            if self.buildtype == 'debug':
                 ET.SubElement(type_config, 'UseDebugLibraries').text = 'true'
                 ET.SubElement(clconf, 'RuntimeLibrary').text = 'MultiThreadedDebugDLL'
             else:
                 ET.SubElement(type_config, 'UseDebugLibraries').text = 'false'
-                ET.SubElement(clconf, 'RuntimeLibrary').text = 'MultiThreaded'
+                ET.SubElement(clconf, 'RuntimeLibrary').text = 'MultiThreadedDLL'
         elif vscrt_type.value == 'mdd':
             ET.SubElement(type_config, 'UseDebugLibraries').text = 'true'
             ET.SubElement(clconf, 'RuntimeLibrary').text = 'MultiThreadedDebugDLL'