Implement RtlStringLength() and RtlStringToWideString() routines

xtoskrnl/CMakeLists.txt

@@ -12,6 +12,7 @@ list(APPEND XTOSKRNL_SOURCE
     ${XTOSKRNL_SOURCE_DIR}/ke/krnlinit.c
     ${XTOSKRNL_SOURCE_DIR}/rtl/memory.c
     ${XTOSKRNL_SOURCE_DIR}/rtl/plist.c
+    ${XTOSKRNL_SOURCE_DIR}/rtl/string.c
     ${XTOSKRNL_SOURCE_DIR}/rtl/widestr.c)
 
 # Set module definition SPEC file