workaround change in llvm picked up by llvm ETA 19

Author: kilograham

src/rp2_common/pico_clib_interface/picolibc_interface.c

@@ -7,6 +7,8 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <unistd.h>
+#include <machine/time.h>
+#include <time.h>
 #include <sys/time.h>
 #include <sys/times.h>