devel/avarice: fix build on GCC architectures

jtag3io.cc: In member function 'virtual void jtag3::deviceAutoConfig()':
jtag3io.cc:579: error: a function-definition is not allowed here before '{' token
jtag3io.cc:775: error: expected `}' at end of input
jtag3io.cc:775: error: expected `}' at end of input

MFH: 2020Q4 (fix build blanket)