Format preprocessor macros more consistently

Within the libjpeg API code, it seems to be more the convention than not
to separate the macro name and value by two or more spaces, which
improves general readability.  Making this consistent across all of
libjpeg-turbo is less about my individual preferences and more about
making it easy to automatically detect variations from our chosen
formatting convention.  I intend to release the script I'm using to
validate this stuff, once it matures and stabilizes a bit.

tjexample.c

@@ -40,8 +40,8 @@
 
 
 #ifdef _WIN32
-#define strcasecmp stricmp
-#define strncasecmp strnicmp
+#define strcasecmp  stricmp
+#define strncasecmp  strnicmp
 #endif
 
 #define _throw(action, message) { \
@@ -49,12 +49,12 @@
   retval = -1;  goto bailout; \
 }
 
-#define _throwtj(action) _throw(action, tjGetErrorStr2(tjInstance))
+#define _throwtj(action)  _throw(action, tjGetErrorStr2(tjInstance))
 
-#define _throwunix(action) _throw(action, strerror(errno))
+#define _throwunix(action)  _throw(action, strerror(errno))
 
-#define DEFAULT_SUBSAMP TJSAMP_444
-#define DEFAULT_QUALITY 95
+#define DEFAULT_SUBSAMP  TJSAMP_444
+#define DEFAULT_QUALITY  95
 
 
 const char *subsampName[TJ_NUMSAMP] = {