ASM_MASM: Populate MSVC runtime library abstraction table

In commit fb3370b6a1 (MSVC: Add abstraction for runtime library
selection, 2019-04-10, v3.15.0-rc1~229^2) we overlooked populating the
runtime library selection flags for the Microsoft assembler.  It does
not actually have any such flags, but since its compiler id is `MSVC`
our generators expect the table to be populated.  Use empty values.

Without this fix, enabling the `ASM_MASM` language with policy `CMP0091`
set to `NEW` causes an error due to the missing table entries.

Fixes: #20236, #19453

Modules/CMakeASM_MASMInformation.cmake

@@ -10,5 +10,11 @@ set(CMAKE_ASM${ASM_DIALECT}_SOURCE_FILE_EXTENSIONS asm)
 
 set(CMAKE_ASM${ASM_DIALECT}_COMPILE_OBJECT "<CMAKE_ASM${ASM_DIALECT}_COMPILER> <DEFINES> <INCLUDES> <FLAGS> /c  /Fo <OBJECT> <SOURCE>")
 
+# The ASM_MASM compiler id for this compiler is "MSVC", so fill out the runtime library table.
+set(CMAKE_ASM${ASM_DIALECT}_COMPILE_OPTIONS_MSVC_RUNTIME_LIBRARY_MultiThreaded         "")
+set(CMAKE_ASM${ASM_DIALECT}_COMPILE_OPTIONS_MSVC_RUNTIME_LIBRARY_MultiThreadedDLL      "")
+set(CMAKE_ASM${ASM_DIALECT}_COMPILE_OPTIONS_MSVC_RUNTIME_LIBRARY_MultiThreadedDebug    "")
+set(CMAKE_ASM${ASM_DIALECT}_COMPILE_OPTIONS_MSVC_RUNTIME_LIBRARY_MultiThreadedDebugDLL "")
+
 include(CMakeASMInformation)
 set(ASM_DIALECT)