CMake: Remove duplicate MSVC check

As of this commit, L98 of winconf.cmake already checks for MSVC
before winconf-msvc calls this macro, so we are guaranteed to be
satisfy the check.

cmake/Modules/MacroConfigureMSVCRuntime.cmake

@@ -1,38 +1,36 @@
 macro(configure_msvc_runtime)
-    if(MSVC)
-        # Default to statically-linked runtime.
-        if("${MSVC_RUNTIME}" STREQUAL "")
-            set(MSVC_RUNTIME "static")
-        endif()
-        # Set compiler options.
-        set(variables
-            CMAKE_C_FLAGS_DEBUG
-            CMAKE_C_FLAGS_MINSIZEREL
-            CMAKE_C_FLAGS_RELEASE
-            CMAKE_C_FLAGS_RELWITHDEBINFO
-            CMAKE_CXX_FLAGS_DEBUG
-            CMAKE_CXX_FLAGS_MINSIZEREL
-            CMAKE_CXX_FLAGS_RELEASE
-            CMAKE_CXX_FLAGS_RELWITHDEBINFO
+    # Default to statically-linked runtime.
+    if("${MSVC_RUNTIME}" STREQUAL "")
+        set(MSVC_RUNTIME "static")
+    endif()
+    # Set compiler options.
+    set(variables
+        CMAKE_C_FLAGS_DEBUG
+        CMAKE_C_FLAGS_MINSIZEREL
+        CMAKE_C_FLAGS_RELEASE
+        CMAKE_C_FLAGS_RELWITHDEBINFO
+        CMAKE_CXX_FLAGS_DEBUG
+        CMAKE_CXX_FLAGS_MINSIZEREL
+        CMAKE_CXX_FLAGS_RELEASE
+        CMAKE_CXX_FLAGS_RELWITHDEBINFO
+    )
+    if(${MSVC_RUNTIME} STREQUAL "static")
+        message(STATUS
+            "MSVC -> forcing use of statically-linked runtime."
+        )
+        foreach(variable ${variables})
+            if(${variable} MATCHES "/MD")
+                string(REGEX REPLACE "/MD" "/MT" ${variable} "${${variable}}")
+            endif()
+        endforeach()
+    else()
+        message(STATUS
+            "MSVC -> forcing use of dynamically-linked runtime."
         )
-        if(${MSVC_RUNTIME} STREQUAL "static")
-            message(STATUS
-                "MSVC -> forcing use of statically-linked runtime."
-            )
-            foreach(variable ${variables})
-                if(${variable} MATCHES "/MD")
-                    string(REGEX REPLACE "/MD" "/MT" ${variable} "${${variable}}")
-                endif()
-            endforeach()
-        else()
-            message(STATUS
-                "MSVC -> forcing use of dynamically-linked runtime."
-            )
-            foreach(variable ${variables})
-                if(${variable} MATCHES "/MT")
-                    string(REGEX REPLACE "/MT" "/MD" ${variable} "${${variable}}")
-                endif()
-            endforeach()
-        endif()
+        foreach(variable ${variables})
+            if(${variable} MATCHES "/MT")
+                string(REGEX REPLACE "/MT" "/MD" ${variable} "${${variable}}")
+            endif()
+        endforeach()
     endif()
 endmacro()