Use consistent/modern code formatting for pointers

The convention used by libjpeg:

    type * variable;

is not very common anymore, because it looks too much like
multiplication.  Some (particularly C++ programmers) prefer to tuck the
pointer symbol against the type:

    type* variable;

to emphasize that a pointer to a type is effectively a new type.
However, this can also be confusing, since defining multiple variables
on the same line would not work properly:

    type* variable1, variable2;  /* Only variable1 is actually a
                                    pointer. */

This commit reformats the entirety of the libjpeg-turbo code base so
that it uses the same code formatting convention for pointers that the
TurboJPEG API code uses:

    type *variable1, *variable2;

This seems to be the most common convention among C programmers, and
it is the convention used by other codec libraries, such as libpng and
libtiff.

jdatadst.c

@@ -24,7 +24,7 @@
 #include "jerror.h"
 
 #ifndef HAVE_STDLIB_H           /* <stdlib.h> should declare malloc(),free() */
-extern void * malloc (size_t size);
+extern void *malloc (size_t size);
 extern void free (void *ptr);
 #endif
 
@@ -34,11 +34,11 @@ extern void free (void *ptr);
 typedef struct {
   struct jpeg_destination_mgr pub; /* public fields */
 
-  FILE * outfile;               /* target stream */
-  JOCTET * buffer;              /* start of buffer */
+  FILE *outfile;                /* target stream */
+  JOCTET *buffer;               /* start of buffer */
 } my_destination_mgr;
 
-typedef my_destination_mgr * my_dest_ptr;
+typedef my_destination_mgr *my_dest_ptr;
 
 #define OUTPUT_BUF_SIZE  4096   /* choose an efficiently fwrite'able size */
 
@@ -49,14 +49,14 @@ typedef my_destination_mgr * my_dest_ptr;
 typedef struct {
   struct jpeg_destination_mgr pub; /* public fields */
 
-  unsigned char ** outbuffer;   /* target buffer */
-  unsigned long * outsize;
-  unsigned char * newbuffer;    /* newly allocated buffer */
-  JOCTET * buffer;              /* start of buffer */
+  unsigned char **outbuffer;    /* target buffer */
+  unsigned long *outsize;
+  unsigned char *newbuffer;     /* newly allocated buffer */
+  JOCTET *buffer;               /* start of buffer */
   size_t bufsize;
 } my_mem_destination_mgr;
 
-typedef my_mem_destination_mgr * my_mem_dest_ptr;
+typedef my_mem_destination_mgr *my_mem_dest_ptr;
 #endif
 
 
@@ -131,7 +131,7 @@ METHODDEF(boolean)
 empty_mem_output_buffer (j_compress_ptr cinfo)
 {
   size_t nextsize;
-  JOCTET * nextbuffer;
+  JOCTET *nextbuffer;
   my_mem_dest_ptr dest = (my_mem_dest_ptr) cinfo->dest;
 
   /* Try to allocate new buffer with double size */
@@ -204,7 +204,7 @@ term_mem_destination (j_compress_ptr cinfo)
  */
 
 GLOBAL(void)
-jpeg_stdio_dest (j_compress_ptr cinfo, FILE * outfile)
+jpeg_stdio_dest (j_compress_ptr cinfo, FILE *outfile)
 {
   my_dest_ptr dest;
 
@@ -245,7 +245,7 @@ jpeg_stdio_dest (j_compress_ptr cinfo, FILE * outfile)
 
 GLOBAL(void)
 jpeg_mem_dest (j_compress_ptr cinfo,
-               unsigned char ** outbuffer, unsigned long * outsize)
+               unsigned char **outbuffer, unsigned long *outsize)
 {
   my_mem_dest_ptr dest;