Re-added lost function memcpy_P
Re-added lost function memcpy_P

This was lost in https://github.com/esp8266/Arduino/commit/80a5f29e89ebb48d2414edd75e1847c3f47798e4

I've also changed the type of src to PGM_VOID_P to match the other changes made in the above commit.

sticilface/Arduino,hallard/Arduino,Adam5Wu/Arduino,quertenmont/Arduino,wemos/Arduino,edog1973/Arduino,me-no-dev/Arduino,Cloudino/Arduino,NextDevBoard/Arduino,Cloudino/Arduino,wemos/Arduino,lrmoreno007/Arduino,Juppit/Arduino,lrmoreno007/Arduino,hallard/Arduino,sticilface/Arduino,gguuss/Arduino,Lan-Hekary/Arduino,CanTireInnovations/Arduino,jes/Arduino,chrisfraser/Arduino,me-no-dev/Arduino,NullMedia/Arduino,Cloudino/Cloudino-Arduino-IDE,toastedcode/esp8266-Arduino,esp8266/Arduino,Cloudino/Arduino,quertenmont/Arduino,chrisfraser/Arduino,chrisfraser/Arduino,NextDevBoard/Arduino,me-no-dev/Arduino,toastedcode/esp8266-Arduino,KaloNK/Arduino,lrmoreno007/Arduino,sticilface/Arduino,martinayotte/ESP8266-Arduino,toastedcode/esp8266-Arduino,Cloudino/Arduino,Links2004/Arduino,KaloNK/Arduino,Links2004/Arduino,NullMedia/Arduino,Adam5Wu/Arduino,esp8266/Arduino,jes/Arduino,edog1973/Arduino,esp8266/Arduino,martinayotte/ESP8266-Arduino,quertenmont/Arduino,Adam5Wu/Arduino,Lan-Hekary/Arduino,Adam5Wu/Arduino,lrmoreno007/Arduino,Lan-Hekary/Arduino,NextDevBoard/Arduino,martinayotte/ESP8266-Arduino,me-no-dev/Arduino,gguuss/Arduino,toastedcode/esp8266-Arduino,jes/Arduino,quertenmont/Arduino,NullMedia/Arduino,Cloudino/Cloudino-Arduino-IDE,Lan-Hekary/Arduino,gguuss/Arduino,martinayotte/ESP8266-Arduino,NullMedia/Arduino,hallard/Arduino,KaloNK/Arduino,Juppit/Arduino,sticilface/Arduino,lrmoreno007/Arduino,jes/Arduino,edog1973/Arduino,esp8266/Arduino,NullMedia/Arduino,wemos/Arduino,chrisfraser/Arduino,CanTireInnovations/Arduino,Cloudino/Cloudino-Arduino-IDE,NextDevBoard/Arduino,wemos/Arduino,Cloudino/Cloudino-Arduino-IDE,Juppit/Arduino,Links2004/Arduino,hallard/Arduino,sticilface/Arduino,edog1973/Arduino,Cloudino/Arduino,wemos/Arduino,CanTireInnovations/Arduino,toastedcode/esp8266-Arduino,Links2004/Arduino,hallard/Arduino,Cloudino/Arduino,martinayotte/ESP8266-Arduino,Juppit/Arduino,CanTireInnovations/Arduino,gguuss/Arduino,Links2004/Arduino,KaloNK/Arduino,Adam5Wu/Arduino,CanTireInnovations/Arduino,CanTireInnovations/Arduino,Lan-Hekary/Arduino,Juppit/Arduino,edog1973/Arduino,KaloNK/Arduino,esp8266/Arduino,NextDevBoard/Arduino,jes/Arduino,Cloudino/Arduino,me-no-dev/Arduino,quertenmont/Arduino,Cloudino/Cloudino-Arduino-IDE,Cloudino/Cloudino-Arduino-IDE,Cloudino/Cloudino-Arduino-IDE,chrisfraser/Arduino,CanTireInnovations/Arduino,gguuss/Arduino