The libsidplayfp makedepend removed since revision 6f2e3f9 of Open Cubic
Player fixes the libsidplayfp include lines to use the local fork of the
libsidplayfp.
The Open Cubic Player has replaced the libsidplay with the local fork of
libsidplayfp. Therefore, libsidplay is not optional dependency anymore,
but we do have two new make depends needed to build the Open Cubic
Player. The new configuration file seems to support GCC up to version
10, and therefore we do not need the patching for configure script
anymore.
Also disabling SDL support when SDL and SDL2 are both installed.
Otherwise linker is having a problems with functions from SDL and SDL2
having the same names.
Using sed to add GCC version 7.* into supported version check.
Also removed timidy++ dependency as timidy source files are downloaded
and compiled into ocp binaries.