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.
diff --git a/jcparam.c b/jcparam.c
index dc7838f..544127e 100644
--- a/jcparam.c
+++ b/jcparam.c
@@ -322,7 +322,7 @@
 GLOBAL(void)
 jpeg_set_colorspace (j_compress_ptr cinfo, J_COLOR_SPACE colorspace)
 {
-  jpeg_component_info * compptr;
+  jpeg_component_info *compptr;
   int ci;
 
 #define SET_COMP(index,id,hsamp,vsamp,quant,dctbl,actbl)  \
@@ -404,7 +404,7 @@
 #ifdef C_PROGRESSIVE_SUPPORTED
 
 LOCAL(jpeg_scan_info *)
-fill_a_scan (jpeg_scan_info * scanptr, int ci,
+fill_a_scan (jpeg_scan_info *scanptr, int ci,
              int Ss, int Se, int Ah, int Al)
 /* Support routine: generate one scan for specified component */
 {
@@ -419,7 +419,7 @@
 }
 
 LOCAL(jpeg_scan_info *)
-fill_scans (jpeg_scan_info * scanptr, int ncomps,
+fill_scans (jpeg_scan_info *scanptr, int ncomps,
             int Ss, int Se, int Ah, int Al)
 /* Support routine: generate one scan for each component */
 {
@@ -438,7 +438,7 @@
 }
 
 LOCAL(jpeg_scan_info *)
-fill_dc_scans (jpeg_scan_info * scanptr, int ncomps, int Ah, int Al)
+fill_dc_scans (jpeg_scan_info *scanptr, int ncomps, int Ah, int Al)
 /* Support routine: generate interleaved DC scan if possible, else N scans */
 {
   int ci;
@@ -470,7 +470,7 @@
 {
   int ncomps = cinfo->num_components;
   int nscans;
-  jpeg_scan_info * scanptr;
+  jpeg_scan_info *scanptr;
 
   /* Safety check to ensure start_compress not called yet. */
   if (cinfo->global_state != CSTATE_START)