s-nail: update to 14.5.1

Hi buddy,
A new upstream update. BTW, we have a tiny issue *not related to* <code>xbps-src</code> (error when stripping armv6 bin, during <code>do_install</code>) probably related to cross-compilation.
```
make[1]: Leaving directory '/builddir/s-nail-14.5.1'
=> s-nail-14.5.1_1: running do_install ...
make[1]: Entering directory '/builddir/s-nail-14.5.1'
Installing..
/bin/strip: Unable to recognise the format of the input file `/destdir/arm-linux-gnueabihf/s-nail-14.5.1/usr/bin/mail'
make[1]: Leaving directory '/builddir/s-nail-14.5.1'
```
It comes from mk.mk:
```
STRIP=/bin/strip
HAVE_STRIP=1
```
I'll talk about that with main dev tomorrow, I'm on it. <code>xbps-src</code> works flawlessly.
```
make[1]: Leaving directory '/builddir/s-nail-14.5.1'
=> s-nail-14.5.1_1: running do_install ...
make[1]: Entering directory '/builddir/s-nail-14.5.1'
Installing..
/bin/strip: Unable to recognise the format of the input file `/destdir/arm-linux-gnueabihf/s-nail-14.5.1/usr/bin/mail'
make[1]: Leaving directory '/builddir/s-nail-14.5.1'
=> s-nail-14.5.1_1: running pkg_install ...
=> s-nail-14.5.1_1: removing libtool archives...
=> s-nail-14.5.1_1: removing python bytecode archives...
=> s-nail-14.5.1_1: processing manual pages...
   Compressing manpage: /usr/share/man/man1/mail.1...
=> s-nail-14.5.1_1: installed successfully to destdir.
=> s-nail-14.5.1_1: creating debug files and stripping, please wait...
   Stripped executable: /usr/bin/mail
=> s-nail-14.5.1_1: verifying required shlibs...
   SONAME: libssl.so.1 <-> libssl>=1.0.0_1
   SONAME: libcrypto.so.1 <-> libssl>=1.0.0_1
   SONAME: libc.so.6 <-> glibc>=2.8_1
=> s-nail-14.5.1_1: building s-nail-14.5.1_1.armv6l.xbps ...
index: added `s-nail-14.5.1_1' (armv6l).
index: 13 packages registered.
index-files: 15 packages registered.
=> s-nail-14.5.1_1: removing autodeps, please wait...
=> s-nail-14.5.1_1: removing autocrossdeps, please wait...
=> s-nail-14.5.1_1: cleaning build directory...
=> s-nail: removing files from destdir...
```

Cheers!