RFC: Support for libjpeg7

[jon.vanalten at redhat.com]

Hi all,

After chasing red herrings (my own fault, as apparently using the more generic libjpeg.so symlink, which according to http://icedtea.classpath.org/bugzilla/show_bug.cgi?id=98 shouldn't be done anyways, caused dlopen to look in a jdk-internal .so file for symbols that weren't there), I've found that simply explicitly dlopen-ing libjpeg.so.7 seems to work just fine.  This addresses  http://icedtea.classpath.org/bugzilla/show_bug.cgi?id=367.  I've tried opening and displaying .jpeg images, changing ColorSpace via ColorConvertOp and writing out the result, rescaling via RescaleOp and writing out the result, seems okay.  The application noted in the bug report launches.

Attached is patch which adds this support.  If this looks good I'll also edit the INSTALL file to indicate the supported library.  The version 7 .so is checked first, as it is newer; if it is not present, it falls back to 6b.  Is this the best strategy?  Any other comments, or suggestions for Java programs that might give good coverage of the use of libjpeg.so in openjdk would be appreciated.

Thx,

jon
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