Update Makefile for macos

[ZardashtKaya]

No description provided.

[TurtleWilly]

Not everyone has homebrew. Maybe use pkg-config instead? Make a check at the start of the makefile if pkg-config is available (in most cases it is with typical homebrew setups)

And then do something like "$(pkg-config --cflags openssl)", see example output from my system:

$ pkg-config --cflags openssl
-I/usr/local/pkgs/openssl/latest@3/include

$ pkg-config --libs openssl
-L/usr/local/pkgs/openssl/latest@3/lib -lssl -lcrypto