Replace X-allocation functions with their C89 counterparts

The only remaining X-functions used in server are XNF*, the rest is converted to
plain alloc/calloc/realloc/free/strdup.

X* functions are still exported from server and x* macros are still defined in
header file, so both ABI and API are not affected by this change.

Signed-off-by: Mikhail Gusarov <dottedmag@dottedmag.net>
Reviewed-by: Peter Hutterer <peter.hutterer@who-t.net>

mi/mipolyutil.c

@@ -99,7 +99,7 @@ miInsertEdgeInET(EdgeTable *ET, EdgeTableEntry *ETE,  int scanline,
     {
         if (*iSLLBlock > SLLSPERBLOCK-1) 
         {
-            tmpSLLBlock = xalloc(sizeof(ScanLineListBlock));
+            tmpSLLBlock = malloc(sizeof(ScanLineListBlock));
 	    if (!tmpSLLBlock)
 		return FALSE;
             (*SLLBlock)->next = tmpSLLBlock;
@@ -379,7 +379,7 @@ miFreeStorage(ScanLineListBlock *pSLLBlock)
     while (pSLLBlock) 
     {
         tmpSLLBlock = pSLLBlock->next;
-        xfree(pSLLBlock);
+        free(pSLLBlock);
         pSLLBlock = tmpSLLBlock;
     }
 }