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/simd/jquant-mmx.asm b/simd/jquant-mmx.asm
index 822c7ee..dbfecee 100644
--- a/simd/jquant-mmx.asm
+++ b/simd/jquant-mmx.asm
@@ -27,12 +27,12 @@
 ;
 ; GLOBAL(void)
 ; jsimd_convsamp_mmx (JSAMPARRAY sample_data, JDIMENSION start_col,
-;                     DCTELEM * workspace);
+;                     DCTELEM *workspace);
 ;
 
 %define sample_data     ebp+8           ; JSAMPARRAY sample_data
 %define start_col       ebp+12          ; JDIMENSION start_col
-%define workspace       ebp+16          ; DCTELEM * workspace
+%define workspace       ebp+16          ; DCTELEM *workspace
 
         align   16
         global  EXTN(jsimd_convsamp_mmx)
@@ -126,8 +126,8 @@
 ;   (http://www.agner.org/assem/).
 ;
 ; GLOBAL(void)
-; jsimd_quantize_mmx (JCOEFPTR coef_block, DCTELEM * divisors,
-;                     DCTELEM * workspace);
+; jsimd_quantize_mmx (JCOEFPTR coef_block, DCTELEM *divisors,
+;                     DCTELEM *workspace);
 ;
 
 %define RECIPROCAL(m,n,b) MMBLOCK(DCTSIZE*0+(m),(n),(b),SIZEOF_DCTELEM)
@@ -136,8 +136,8 @@
 %define SHIFT(m,n,b)      MMBLOCK(DCTSIZE*3+(m),(n),(b),SIZEOF_DCTELEM)
 
 %define coef_block      ebp+8           ; JCOEFPTR coef_block
-%define divisors        ebp+12          ; DCTELEM * divisors
-%define workspace       ebp+16          ; DCTELEM * workspace
+%define divisors        ebp+12          ; DCTELEM *divisors
+%define workspace       ebp+16          ; DCTELEM *workspace
 
         align   16
         global  EXTN(jsimd_quantize_mmx)