[UCRT] Add CMake files

sdk/lib/ucrt/string/string.cmake

@@ -0,0 +1,58 @@
+
+list(APPEND UCRT_STRING_SOURCES
+    string/memcpy_s.cpp
+    string/memicmp.cpp
+    string/strcat_s.cpp
+    string/strcoll.cpp
+    string/strcpy_s.cpp
+    string/strdup.cpp
+    string/stricmp.cpp
+    string/stricoll.cpp
+    string/strlwr.cpp
+    string/strncat_s.cpp
+    string/strncnt.cpp
+    string/strncoll.cpp
+    string/strncpy_s.cpp
+    string/strnicmp.cpp
+    string/strnicol.cpp
+    string/strnlen.cpp
+    string/strnset_s.cpp
+    string/strset_s.cpp
+    string/strtok.cpp
+    string/strtok_s.cpp
+    string/strupr.cpp
+    string/strxfrm.cpp
+    string/wcscat.cpp
+    string/wcscat_s.cpp
+    string/wcscmp.cpp
+    string/wcscoll.cpp
+    string/wcscpy.cpp
+    string/wcscpy_s.cpp
+    string/wcscspn.cpp
+    string/wcsdup.cpp
+    string/wcsicmp.cpp
+    string/wcsicoll.cpp
+    string/wcslwr.cpp
+    string/wcsncat.cpp
+    string/wcsncat_s.cpp
+    string/wcsncmp.cpp
+    string/wcsncnt.cpp
+    string/wcsncoll.cpp
+    string/wcsncpy.cpp
+    string/wcsncpy_s.cpp
+    string/wcsnicmp.cpp
+    string/wcsnicol.cpp
+    string/wcsnset.cpp
+    string/wcsnset_s.cpp
+    string/wcspbrk.cpp
+    string/wcsrev.cpp
+    string/wcsset.cpp
+    string/wcsset_s.cpp
+    string/wcsspn.cpp
+    string/wcstok.cpp
+    string/wcstok_s.cpp
+    string/wcsupr.cpp
+    string/wcsxfrm.cpp
+    string/wmemcpy_s.cpp
+    string/wmemmove_s.cpp
+)