libtcc: Accept "-g0" to disable debug in addition to "-g", "-g1", "-g2" and "-g3"
libtcc: Accept "-g0" to disable debug in addition to "-g", "-g1", "-g2" and "-g3"

This does not change our generated code.

Signed-off-by: Detlef Riekenberg <5b34c30a9957d3fa950a6a78115c5f5e8e9225f7@web.de>

mirror/tinycc,mirror/tinycc,mirror/tinycc,mirror/tinycc