Modifications required for a clean First Edition disk-images build

[Jim-F]

I recently (successfully) got the reconstructed Unix First Edition
working under SimH. I built the disk images under
OpenSUSE Linux Tumbleweed (fully updated as of this writing).

However, in order to get a clean build, I needed to make
the following changes to this distribution package
(where represents the top level of
the extracted package, containing the top-level Makefile).

In /tools/apout/fp.c
"int AC" needs to be "static int AC"
in order to avoid "multiple definition" collision with
"int32_t AC" in ke11a.c (imported in v1trap.c)

In /patches/core/initorig.patch
--- init.clean. . .
+++ init.s. . .
needs to be changed to:
--- build/init.clean. . .
+++ build/init.s. . .
in order to avoid failure of this patch

Directory '/images' needs to be created manually

Not strictly necessary, but to avoid
"warning: Clock skew detected. Your build may be incomplete."
modify /build/Makefile and add:

1. "touch *.clean"
   following "@touch cleansrc"

2. "touch *.s"
   following "@touch patched"

3. "touch *.dsk"
   following "@touch images"

[jserv]

The repository unix-v1 did some slight modifications to allow the builds on both Linux and macOS.