Fix https crash

>> read https://stackoverflow.com/users/login

becomes a timeout instead of a crash
Initialize dh_ctx

This avoids a crash by:
>> dh: dh-make-key
>> dh-generate-key dh
Whitespace police: aes.h
aes.h: cleanup #include
-fixed bug in zlib caused PNG encode to crash
[Makefile] fix 32-bit build