Drop unused Malloc redirection.

In the only place where we actually do redirect malloc, it's done a
different way.  Thus, this piece of code merely complicates analysis,
and makes the speed (negligibly) slower.

I'm leaving it as #defines, in case we'd want to redirect in the future.

src/util.c

@@ -52,14 +52,6 @@ unsigned long long Pagesize;
 /* allocation/mmap granularity */
 unsigned long long Mmap_align;
 
-/*
- * our versions of malloc & friends start off pointing to the libc versions
- */
-Malloc_func Malloc = malloc;
-Free_func Free = free;
-Realloc_func Realloc = realloc;
-Strdup_func Strdup = strdup;
-
 /*
  * Zalloc -- allocate zeroed memory
  */
@@ -224,21 +216,6 @@ util_checksum_seq(const void *addr, size_t len, uint64_t csum)
 	return (uint64_t)hi32 << 32 | lo32;
 }
 
-/*
- * util_set_alloc_funcs -- allow one to override malloc, etc.
- */
-void
-util_set_alloc_funcs(void *(*malloc_func)(size_t size),
-		void (*free_func)(void *ptr),
-		void *(*realloc_func)(void *ptr, size_t size),
-		char *(*strdup_func)(const char *s))
-{
-	Malloc = (malloc_func == NULL) ? malloc : malloc_func;
-	Free = (free_func == NULL) ? free : free_func;
-	Realloc = (realloc_func == NULL) ? realloc : realloc_func;
-	Strdup = (strdup_func == NULL) ? strdup : strdup_func;
-}
-
 /*
  * util_fgets -- fgets wrapper with conversion CRLF to LF
  */

src/util.h

@@ -76,15 +76,10 @@ extern unsigned long long Mmap_align;
 /*
  * overridable names for malloc & friends used by this library
  */
-typedef void *(*Malloc_func)(size_t size);
-typedef void (*Free_func)(void *ptr);
-typedef void *(*Realloc_func)(void *ptr, size_t size);
-typedef char *(*Strdup_func)(const char *s);
-
-extern Malloc_func Malloc;
-extern Free_func Free;
-extern Realloc_func Realloc;
-extern Strdup_func Strdup;
+#define Malloc malloc
+#define Free free
+#define Realloc realloc
+#define Strdup strdup
 extern void *Zalloc(size_t sz);
 
 void util_init(void);
@@ -118,12 +113,6 @@ int util_toUTF8_buff(const wchar_t *in, char *out, size_t out_size);
 #define UTIL_MAX_ERR_MSG 128
 void util_strerror(int errnum, char *buff, size_t bufflen);
 
-void util_set_alloc_funcs(
-		void *(*malloc_func)(size_t size),
-		void (*free_func)(void *ptr),
-		void *(*realloc_func)(void *ptr, size_t size),
-		char *(*strdup_func)(const char *s));
-
 /*
  * Macro calculates number of elements in given table
  */