[netsurf-dev] Toolchain build for AmigaOS4

Hi all

I've had some issues this year with various things not working, and
tracked it down to the OS4 betas and (indirectly) the update of the
SDK.  There were two problems;
1. DNS resolution was not working.  I fixed this at the start of the
year but after fixing (2) it broke again in a different way.  I've
temporarily disabled the threaded resolver until I can find a more
permanent solution.
2. SSL/TLS sites were not opening.  I'm not sure why but it may be the
same problem as OS3 was having with OpenSSL.  As AmiSSL is kept
up-to-date now, unlike when I started porting NetSurf, I've switched the
OS4 build over to using AmiSSL.

Please can somebody check and merge my chris/amissl-os4 branch into
toolchains, and rebuild the ppc-amigaos toolchain?
The equivalent chris/amissl-os4 branch can then be merged into NetSurf
and the CI builds should be working again on OS4 beta.

Thanks!
Chris