* system.h (GCCBUGURL): Delete.
	* version.c (bug_report_url): New.  Add commentary about
	modifying both these strings in modified distributions.
	* version.h: Declare bug_report_url.

	* diagnostic.c, gcc.c, gcov.c, java/gjavah.c, java/jcf-dump.c,
	java/jv-scan.c: Globally replace GCCBUGURL with bug_report_url.

From-SVN: r57932