First release candidate for GDB 6.4 available

[Newman, Sarah R]

cygwin version 1.5.18-1:

		=== gdb Summary ===

# of expected passes		8323
# of unexpected failures	855
# of expected failures		30
# of known failures		14
# of unresolved testcases	604
# of untested testcases		7
# of unsupported tests		25