* gdb.java/jmain.exp: Fix expected line number for main to
break at. Set XFAIL for break at main test since gcj does not
provide line number info for first statement in main.
(subdirs, clean, distclean): Use it.
* gdb.arch/Makefile.in: Clean up Makefile. Remove rules for
regenerating Makefile, since it is generated from the top level.
* gdb.asm/Makefile.in: Likewise.
* gdb.base/Makefile.in: Likewise.
* gdb.c++/Makefile.in: Likewise.
* gdb.disasm/Makefile.in: Likewise.
* gdb.java/Makefile.in: Likewise.
* gdb.mi/Makefile.in: Likewise.
* gdb.threads/Makefile.in: Likewise.
* gdb.trace/Makefile.in: Likewise.