Changes

SDK/c-ares: m68k-unknown-amigaos needs -lm

sdk: Fix libexpat download URL

ppc-amigaos: Remove patch which prevents DNS resolution on newer OS4.1
beta

m68k-unknown-amigaos: Update AmiSSL to v5.13

m68k-unknown-amigaos: Switch libcurl to AmiSSL v5
libcurl+OpenSSL+NetSurf doesn't connect to secure sites under OS3.x.
Confirmed libcurl+AmiSSL (v5.13)+NetSurf, along with Miami, is a working
combination under AmigaOS 3.2.2.1

m68k-unknown-amigaos: revert openssl bsdsocket change This wasn't
relevant to the AmiSSL change and should have been left alone.

ppc-amigaos: Avoid use of gethostbyname_r as it is unstable

Amiga: Build libcurl against AmiSSL on OS4

ppc-amigaos: Disable threaded resolver

Fix makefile directory dependancy
gnu make simply rebuilds every time if directories are normal 
prerequisites. Change to use order only prerequisite.

Update cares to version 1.34.2