basically the ouput of strace changed with glibc-2.26:
"Since version 2.26, the glibc wrapper function for open() employs the
openat() system call, rather than the kernel's open() system call".

so support both ways (in case it would be backported):
open("foobar...)
openat(AT_FDCWD, "foobar...)

need to expand macro when using "matching"

- perl modules are now in /usr/LIB/perl5 (bin) or /usr/share/perl5 (noarch)
- ARCH-linux-thread-multi & version is no more used in path

Instead of armv7l as detected from uname -m.
Perl files are installed in /usr/lib/perl5/<version>/arm-linux-thread-multi

This ignores /sbin and /bin paths then they are symlinks and avoids
misleading messages being printed when building stage2 and rescue

The list already contains /sbin and /bin which are just symlinks to the
above, but the order is different for / vs. /usr.

Due to the symlinks we always prefer sbin over bin anyway, so this change
doesn't technically change anything but does clarify things

needed in order to pinpoint & fix:

Backslash found where operator expected at -e line 2, near ";}continue{print or die qq(-p destination: $!\"
       (Missing operator before \?)
Final $ should be \$ or $name at -e line 1, within string
syntax error at -e line 2, near ";}continue{print or die qq(-p destination: $!"
  (Might be a runaway multi-line !! string starting on line 1)
Execution of -e aborted due to compilation errors.

(see next commit)

build time)