patch #7876 JTAGICE mkII fails to connect to attiny if debugwire
is enabled AND target has a very slow clock
* jtagmkII.c (jtagmkII_getsync): When leaving debugWIRE mode
temporarily, immediately retry with ISP, rather than leaving.
* stk500v2 (stk500v2_program_enable): Implemented similar logic
for the JTAGICE3.
git-svn-id: svn://svn.savannah.nongnu.org/avrdude/trunk@1183 81a1dc3b-b13d-400b-aceb-764788c761c2