Fix NMI interrupt handler alignment
Fix NMI interrupt handler alignment

as suggested at http://www.esp8266.com/viewtopic.php?f=6&t=4675&start=48#p46002

NullMedia/Arduino,martinayotte/ESP8266-Arduino,martinayotte/ESP8266-Arduino,martinayotte/ESP8266-Arduino,lrmoreno007/Arduino,hallard/Arduino,esp8266/Arduino,Adam5Wu/Arduino,Adam5Wu/Arduino,quertenmont/Arduino,KaloNK/Arduino,Lan-Hekary/Arduino,me-no-dev/Arduino,esp8266/Arduino,hallard/Arduino,me-no-dev/Arduino,wemos/Arduino,KaloNK/Arduino,jes/Arduino,jes/Arduino,lrmoreno007/Arduino,esp8266/Arduino,sticilface/Arduino,Adam5Wu/Arduino,toastedcode/esp8266-Arduino,wemos/Arduino,quertenmont/Arduino,Lan-Hekary/Arduino,hallard/Arduino,wemos/Arduino,gguuss/Arduino,gguuss/Arduino,Adam5Wu/Arduino,gguuss/Arduino,hallard/Arduino,KaloNK/Arduino,jes/Arduino,wemos/Arduino,quertenmont/Arduino,martinayotte/ESP8266-Arduino,quertenmont/Arduino,Juppit/Arduino,KaloNK/Arduino,toastedcode/esp8266-Arduino,Juppit/Arduino,toastedcode/esp8266-Arduino,martinayotte/ESP8266-Arduino,lrmoreno007/Arduino,Lan-Hekary/Arduino,lrmoreno007/Arduino,NullMedia/Arduino,me-no-dev/Arduino,Lan-Hekary/Arduino,gguuss/Arduino,esp8266/Arduino,sticilface/Arduino,toastedcode/esp8266-Arduino,jes/Arduino,sticilface/Arduino,hallard/Arduino,esp8266/Arduino,KaloNK/Arduino,sticilface/Arduino,Juppit/Arduino,gguuss/Arduino,quertenmont/Arduino,Juppit/Arduino,NullMedia/Arduino,me-no-dev/Arduino,wemos/Arduino,Adam5Wu/Arduino,NullMedia/Arduino,toastedcode/esp8266-Arduino,me-no-dev/Arduino,Lan-Hekary/Arduino,jes/Arduino,sticilface/Arduino,Juppit/Arduino,NullMedia/Arduino,lrmoreno007/Arduino