Latest commit won't compile for ESP8266

[lodger-c64]

When compiling the latest commit, I get the following error in 'proto_hostcm.ino' for ESP8266 compiles:

In file included from /home/nhaede/.arduino15/packages/esp8266/hardware/esp8266/2.7.1/tools/sdk/libc/xtensa-lx106-elf/include/sys/stdio.h:6:0,
from /home/nhaede/.arduino15/packages/esp8266/hardware/esp8266/2.7.1/tools/sdk/libc/xtensa-lx106-elf/include/stdio.h:63,
from /home/nhaede/.arduino15/packages/esp8266/hardware/esp8266/2.7.1/cores/esp8266/Arduino.h:32,
from sketch/zimodem.ino.cpp:1:
/home/nhaede/.arduino15/packages/esp8266/hardware/esp8266/2.7.1/tools/sdk/libc/xtensa-lx106-elf/include/sys/pgmspace.h:25:130: error: section attribute not allowed for 'opt'
#define PROGMEM attribute((section( "".irom.text." FILE "." __STRINGIZE(LINE) "." __STRINGIZE(COUNTER) """)))
^
/home/nhaede/src/Zimodem/zimodem/proto_hostcm.h:17:9: note: in expansion of macro 'PROGMEM'
} opt PROGMEM;
^
In file included from /home/nhaede/src/Zimodem/zimodem/proto_hostcm.ino:2:0:
proto_hostcm.h:21:33: error: section attribute not allowed for 'sumchar'
const char *sumchar PROGMEM = "ABCDEFGHIJKLMNOP";
^
exit status 1
section attribute not allowed for 'sumchar'

[bozimmerman]

should be fixed now