Duane Ellis: fix warnings

configure.in

src/flash/flash.c

src/flash/flash.h

src/helper/command.h

src/helper/log.h

src/helper/time_support.h

src/jtag/amt_jtagaccel.c

src/jtag/gw16012.c

src/jtag/jtag.c

src/jtag/jtag.h

src/main.c

src/server/gdb_server.c

src/server/gdb_server.h

src/server/server.c

src/server/server.h

src/target/arm11.c

src/target/arm720t.c

src/target/arm7tdmi.c

src/target/arm920t.c

src/target/arm926ejs.c