[UCRT] Add CMake files

sdk/lib/ucrt/stdlib/stdlib.cmake

@@ -0,0 +1,24 @@
+
+list(APPEND UCRT_STDLIB_SOURCES
+    stdlib/abs.cpp
+    stdlib/bsearch.cpp
+    stdlib/bsearch_s.cpp
+    stdlib/byteswap.cpp
+    stdlib/div.cpp
+    stdlib/imaxabs.cpp
+    stdlib/imaxdiv.cpp
+    stdlib/labs.cpp
+    stdlib/ldiv.cpp
+    stdlib/lfind.cpp
+    stdlib/lfind_s.cpp
+    stdlib/llabs.cpp
+    stdlib/lldiv.cpp
+    stdlib/lsearch.cpp
+    stdlib/lsearch_s.cpp
+    stdlib/qsort.cpp
+    stdlib/qsort_s.cpp
+    stdlib/rand.cpp
+    stdlib/rand_s.cpp
+    stdlib/rotl.cpp
+    stdlib/rotr.cpp
+)