Move ANSI C standard prototypes to stdlib.h; leave the gPXE-specific

function prototypes (e.g. malloc_dma()) in malloc.h.

src/include/malloc.h

  *
  */
 
+/*
+ * Prototypes for the standard functions (malloc() et al) are in
+ * stdlib.h.  Include <malloc.h> only if you need the non-standard
+ * functions, such as malloc_dma().
+ *
+ */
+#include <stdlib.h>
+
 extern void * alloc_memblock ( size_t size, size_t align );
 extern void free_memblock ( void *ptr, size_t size );
-extern void * realloc ( void *old_ptr, size_t new_size );
-extern void * malloc ( size_t size );
-extern void free ( void *ptr );
 extern void mpopulate ( void *start, size_t len );
 extern void mdumpfree ( void );
 
 	free_memblock ( ptr, size );
 }
 
-/**
- * Allocate cleared memory
- *
- * @v nmemb		Number of members
- * @v size		Size of each member
- * @ret ptr		Allocated memory
- *
- * Allocate memory as per malloc(), and zero it.
- *
- * Note that malloc() and calloc() are identical, in the interests of
- * reducing code size.  Callers should not, however, rely on malloc()
- * clearing memory, since this behaviour may change in future.
- */
-static inline void * calloc ( size_t nmemb, size_t size ) {
-	return malloc ( nmemb * size );
-}
-
 #endif /* _MALLOC_H */

src/include/stdlib.h

 #define STDLIB_H
 
 extern unsigned long strtoul ( const char *p, char **endp, int base );
+extern void * realloc ( void *old_ptr, size_t new_size );
+extern void * malloc ( size_t size );
+extern void free ( void *ptr );
+
+/**
+ * Allocate cleared memory
+ *
+ * @v nmemb		Number of members
+ * @v size		Size of each member
+ * @ret ptr		Allocated memory
+ *
+ * Allocate memory as per malloc(), and zero it.
+ *
+ * Note that malloc() and calloc() are identical, in the interests of
+ * reducing code size.  Callers should not, however, rely on malloc()
+ * clearing memory, since this behaviour may change in future.
+ */
+static inline void * calloc ( size_t nmemb, size_t size ) {
+	return malloc ( nmemb * size );
+}
 
 #endif /* STDLIB_H */