On my system, (usually) depcomp is deleted during autoreconf. The
reasons for this are very unclear but appear to be timestamp related.
This seems to fix it.
Most of the times, libtoolize.in was not being regenerated by bootstrap. However, there was at least one spurious case where it got regenerated, leading to a package with a different checksum. By deleting it before running bootstrap, it will be always regenerated.
The Linux kernel is already built with CONFIG_M686=y, which suggests that the bootstrap is not supported on anything older thant i686. So, use i686 on userspace too. Some software, such as gettext, cmake or elfutils, has trouble building for i386 due to missing atomic intrinsics.
For example, building gettext 0.26 would fail with:
```
/usr/lib/i386-unknown-linux-musl/gcc/i386-unknown-linux-musl/13.3.0/../../../../../i386-unknown-linux-musl/bin/ld: /build/gettext-0.26_1/gettext-0.26/build/gettext-tools/gnulib-lib/.libs/libgettextlib.so: undefined reference to `__atomic_compare_exchange_4'
```
When using file:// mirrors, rootfs.py will spawn a local HTTP
server at 127.0.0.1.
In combination with --qemu, this poses a problem: downloads
on the host machine will work, but downloads on the guest
machine will not reach the local server.
This commit introduces a change to rewrite the address to
10.0.2.2 inside the guest, only when QEMU=True is set in
the configuration, allowing this combination to build
past the get_network improvement step.
Failures in "after" scripts do not currently result in bootstrap
failures since "find" ignores the exit code of commands that it
executes.
There are no simple options in "find" to both propagate non-0 exit
statuses of executed commands and also abort its command execution
sequence in such an event. As such, use "find" only for listing
script names and otherwise use a simple loop to execute them.
While at it, execute scripts in numerical order according to their
basename. This gives consumers control over the execution order of
their scripts. For example, 50-sign.sh will be executed before
51-upload.sh.
