libc: Stub out strftime

libs/libc/include/time.h

@@ -1,6 +1,8 @@
 #ifndef _TIME_H
 #define _TIME_H
 
+#include <stddef.h>
+
 typedef long int clock_t;
 typedef long int time_t;
 
@@ -36,6 +38,7 @@ extern "C"
 
     struct tm* localtime(const time_t* timep);                                         // Not implemented.
     struct tm* gmtime(const time_t* timep);                                            // Not implemented.
+    size_t strftime(char* str, size_t max, const char* format, const struct tm* time); // Not implemented.
 
 #ifdef __cplusplus
 }

libs/libc/src/time.cpp

@@ -28,4 +28,9 @@ extern "C"
     {
         NOT_IMPLEMENTED("gmtime");
     }
+
+    size_t strftime(char*, size_t, const char*, const struct tm*)
+    {
+        NOT_IMPLEMENTED("strftime");
+    }
 }