5049146 - Make XAWT the default Toolkit on Solaris.

This is causing performance regressions on startup3, start_application_swing, start_application_awt, start_applet_awt, start_jpi and start_jws.

Alacrity is showing :-
8% regression for startup3
~ 20 to 30% regression on the start_* benchmarks.


1.6.0 b24-02-13 (Mawt) vs. 1.6.0 b24-02-13 (Xawt)
http://alacrity/query/ones.jsp?VersionSelector_baseline=1.6.0%7Cb24-02-13-Mawt_235324&VersionSelector=1.6.0%7Cb24-02-13-Xawt_192129&esum=Summary&pval=0.01&type_baseline=o&type_build=o

Trentool for nighly runs:
Startup3: http://alacrity/trends/n/1.6.0/solaris_sparcv9_c1_32/startup3_scatter.jpg
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