Replace ctor/dtor priority mechanism with direct init/exit calls - #450
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clib4's own initialization no longer relies on GCC constructor/destructor attributes with priorities walked via .ctors/.dtors: libOpen()/libClose() now call the init/exit functions directly in a fixed order through clib4_init()/clib4_exit(), so no other library with a same or lower constructor priority can run in between clib4's own initialization steps. The init/exit functions are plain functions named *_init/*_exit. The satellite static libraries (libamiga, librt, libpthread) are not part of clib4.library and still register their init/exit functions via constructor/destructor attributes in the executable's ctor/dtor lists.
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clib4's own initialization no longer relies on GCC constructor/destructor attributes with priorities walked via .ctors/.dtors: libOpen()/libClose() now call the init/exit functions directly in a fixed order through clib4_init()/clib4_exit(), so no other library with a same or lower constructor priority can run in between clib4's own initialization steps. The init/exit functions are plain functions named _init/_exit.
The satellite static libraries (libamiga, librt, libpthread) are not part of clib4.library and still register their init/exit functions via constructor/destructor attributes in the executable's ctor/dtor lists.