makefile: add back the additional CXX flags

mickelson / attract

A graphical front-end for command line emulators that hides the underlying operating system and is intended to be controlled with a joystick or gamepad.

http://attractmode.org

GNU General Public License v3.0

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makefile: add back the additional CXX flags #712

Closed cmitu closed 2 years ago

cmitu commented 2 years ago

Similar to how CFLAGS allowed external build parameters before 502f5d71. Useful for passing additional compiler options and optimisations during build.

Fixes: #711

mickelson commented 2 years ago

thanks!