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.

simd/jfdctflt-sse.asm

@@ -55,10 +55,10 @@ PD_1_306        times 4 dd  1.306562964876376527856643
 ; Perform the forward DCT on one block of samples.
 ;
 ; GLOBAL(void)
-; jsimd_fdct_float_sse (FAST_FLOAT * data)
+; jsimd_fdct_float_sse (FAST_FLOAT *data)
 ;
 
-%define data(b)         (b)+8           ; FAST_FLOAT * data
+%define data(b)         (b)+8           ; FAST_FLOAT *data
 
 %define original_ebp    ebp+0
 %define wk(i)           ebp-(WK_NUM-(i))*SIZEOF_XMMWORD ; xmmword wk[WK_NUM]