[OpenJDK 2D-Dev] Dont use libjpeg-internal macros in splashscreen

[Omair Majid]

Hi,

As indicated in the libjpeg API documentation [1], the standard libjpeg
headers are: jpeglib.h, jerror.h, jconfig.h, jmorecfg.h.

splashscreen_jpeg.c violates this layering and uses the SIZEOF macro
from the non-public header jinclude.h directly. This macro is a wrapper
over sizeof. The code in splashscreen_jpeg.c already uses sizeof in
multiple places so it seems like it should be okay to use it in some
more.

The following webrev fixes it:
http://cr.openjdk.java.net/~omajid/webrevs/libjpeg-internal-macros/01/ 

One motivation of having this patch is that if/when we add
system-libjpeg support, the header jinclude.h will become inaccessible.

Thanks,
Omair

[1] http://svn.code.sf.net/p/libjpeg-turbo/code/trunk/libjpeg.txt

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