Remove Xcalloc/Xmalloc/Xfree calls

These calls allowed Xlib to use a custom memory allocator, but Xlib has
used the standard C library functions since at least its initial import
into git in 2003. It seems unlikely that it will grow a custom memory
allocator. The functions now just add extra overhead. Replacing them
will make future Coccinelle patches simpler.

This patch has been generated by the following Coccinelle semantic
patch:

// Remove Xcalloc/Xmalloc/Xfree calls

@@ expression E1, E2; @@
- Xcalloc (E1, E2)
+ calloc (E1, E2)

@@ expression E; @@
- Xmalloc (E)
+ malloc (E)

@@ expression E; @@
- Xfree (E)
+ free (E)

@@ expression E; @@
- XFree (E)
+ free (E)

Reviewed-by: Brian Paul <brianp@vmware.com>

src/glx/singlepix.c

@@ -68,7 +68,7 @@ __indirect_glGetSeparableFilter(GLenum target, GLenum format, GLenum type,
       heightsize = __glImageSize(height, 1, 1, format, type, 0);
 
       /* Allocate a holding buffer to transform the data from */
-      rowBuf = (GLubyte *) Xmalloc(widthsize);
+      rowBuf = (GLubyte *) malloc(widthsize);
       if (!rowBuf) {
          /* Throw data away */
          _XEatData(dpy, compsize);
@@ -80,9 +80,9 @@ __indirect_glGetSeparableFilter(GLenum target, GLenum format, GLenum type,
       else {
          __GLX_SINGLE_GET_CHAR_ARRAY(((char *) rowBuf), widthsize);
          __glEmptyImage(gc, 1, width, 1, 1, format, type, rowBuf, row);
-         Xfree((char *) rowBuf);
+         free((char *) rowBuf);
       }
-      colBuf = (GLubyte *) Xmalloc(heightsize);
+      colBuf = (GLubyte *) malloc(heightsize);
       if (!colBuf) {
          /* Throw data away */
          _XEatData(dpy, compsize - __GLX_PAD(widthsize));
@@ -94,7 +94,7 @@ __indirect_glGetSeparableFilter(GLenum target, GLenum format, GLenum type,
       else {
          __GLX_SINGLE_GET_CHAR_ARRAY(((char *) colBuf), heightsize);
          __glEmptyImage(gc, 1, height, 1, 1, format, type, colBuf, column);
-         Xfree((char *) colBuf);
+         free((char *) colBuf);
       }
    }
    else {
@@ -155,8 +155,7 @@ void gl_dispatch_stub_GetSeparableFilterEXT (GLenum target, GLenum format,
             const GLint heightsize =
                __glImageSize(height, 1, 1, format, type, 0);
             GLubyte *const buf =
-               (GLubyte *) Xmalloc((widthsize > heightsize) ? widthsize :
-                                   heightsize);
+               (GLubyte *) malloc((widthsize > heightsize) ? widthsize : heightsize);
 
             if (buf == NULL) {
                /* Throw data away */
@@ -186,7 +185,7 @@ void gl_dispatch_stub_GetSeparableFilterEXT (GLenum target, GLenum format,
 
                __glEmptyImage(gc, 1, height, 1, 1, format, type, buf, column);
 
-               Xfree((char *) buf);
+               free((char *) buf);
             }
          }
       }