time: Build wcsftime.c when using cmake

This file was left out of the cmake build.

Signed-off-by: Keith Packard <[email protected]>

Author: keith-packard

newlib/libc/time/CMakeLists.txt

@@ -53,4 +53,5 @@ picolibc_sources(
   tzcalc_limits.c
   tzset.c
   tzvars.c
+  wcsftime.c
   )