Merge pull request #71 from Lawlieta/master

【修复】宏重复定义问题

port/genhdr/qstrdefs.generated.h

@@ -698,7 +698,6 @@ QDEF(MP_QSTR_ffifunc, (const byte*)"\x92\x07" "ffifunc")
 QDEF(MP_QSTR_fficallback, (const byte*)"\xc5\x0b" "fficallback")
 QDEF(MP_QSTR_ffivar, (const byte*)"\x49\x06" "ffivar")
 QDEF(MP_QSTR_ADC, (const byte*)"\x63\x03" "ADC")
-QDEF(MP_QSTR_channel, (const byte*)"\x26\x07" "channel")
 QDEF(MP_QSTR_duty, (const byte*)"\x19\x04" "duty")
 QDEF(MP_QSTR_PWM, (const byte*)"\x4f\x03" "PWM")
 QDEF(MP_QSTR_network, (const byte*)"\x5b\x07" "network")