The `objcopy` logic to produce a symbol file doesn't work on OSX, and it
seems it needs different lgoic to produce debug information, so for now
we're just going to skip it.
BUILD_QB64=y sets the default EXE name to 'qb64', which is actually
wrong on Windows because it does not include the `.exe` extention. It
also works anyway but `objcopy` doesn't recognize the file without the
extension present.
The symbol file is a file that aids in debugging by allowing a crash
dump from a stripped executable to have it's symbols applied to it. The
file itself ends up in ./internal/temp after compilation and is called
`EXEFILE.sym`.
FIxes: #53
The Makefile was incorrectly tying together _ICON and icon.rc, making it
impossible to use one without the other. To fix this we introduce a new
DEP_ICON_RC flag, which indicates we need to use the icon.rc file (in
addition to regular icon support). DEP_ICON now only indicates we need
to support _ICON, and does not attempt to build the resource
information.
