Easy.
Find a home with someone who WANTS to take care of a bulldog.
Pay for good vet care.
Build a little dog house with an $80 window AC unit. Plug it into an extension cord.
Have plenty of ice and water.
Don't run him around all over the place when it's hot. Let him just sit and chill.
Don't lock him outdoors in the direct sun for 4 hours when its 105 degrees out.
Easy.