lib: micro-c: implement sbrk emulation and dlmalloc

lib/ulibc/stdlib/abort.c

@@ -0,0 +1,4 @@
+void abort(void)
+{
+	/* TODO */
+}

lib/ulibc/stdlib/malloc.c

@@ -589,7 +589,15 @@ MAX_RELEASE_CHECK_RATE   default: 4095 unless not HAVE_MMAP
 #endif  /* DARWIN */
 
 #if defined(__mango__)
-#define LACKS_SYS_TYPES_H
+#include <stddef.h>
+#define LACKS_SYS_TYPES_H 1
+#define NO_MALLOC_STATS 1
+#define HAVE_MORECORE 1
+#define HAVE_MMAP 0
+#define LACKS_TIME_H 1
+#define LACKS_SCHED_H 1
+#define LACKS_SYS_PARAM_H 1
+#define MALLOC_FAILURE_ACTION
 #endif
 
 #ifndef LACKS_SYS_TYPES_H