Remove {LOAD,COUNT}_TEXTA from libsa loadfile, it only made sense for a.out
kernels and we no longer have any.

Work in progress standalone boot blocks for OpenBSD/loongson systems. Will
load a kernel from the OpenBSD partition, with symbols.
However:
- does not work on gdium (usb i/o errors)
- no countdown du

Work in progress standalone boot blocks for OpenBSD/loongson systems. Will
load a kernel from the OpenBSD partition, with symbols.
However:
- does not work on gdium (usb i/o errors)
- no countdown due to PMON limitations, so either `bsd' in the PMON
environment contains a kernel filename to load, and it will get loaded
immediately, or it doesn't (e.g. the variable does no exist) and you get
a prompt and can pass options to the kernel. Note that /etc/boot.conf
commands can still be used in both cases.
- does not work for me when loaded automatically from PMON (put in the `al'
environment variable). However, `boot $al' works fine. Need to investigate.

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