Reconcile indentation, whitespace, and other code formatting with libjpeg-turbo.

For whatever reason, some of these files didn't get fully merged from
libjpeg-turbo 1.4.  They still contained tab characters and other formatting
conventions from libjpeg-turbo 1.3.  This patch also fixes some obvious
indentation errors in the mozjpeg-specific code.  There is more formatting work
that needs to be done to the mozjpeg-specific code, to fix line overruns,
incorrect operator whitespace, and other issues that make it not consistent
with the libjpeg/libjpeg-turbo code.

jchuff.h

@@ -29,8 +29,8 @@
 /* Derived data constructed for each Huffman table */
 
 typedef struct {
-  unsigned int ehufco[256];	/* code for each symbol */
-  char ehufsi[256];		/* length of code for each symbol */
+  unsigned int ehufco[256];     /* code for each symbol */
+  char ehufsi[256];             /* length of code for each symbol */
   /* If no code has been allocated for a symbol S, ehufsi[S] contains 0 */
 } c_derived_tbl;