build: updated build.sh to correctly support pkg-config to avoid build host environment leaking.
misc: updated environment_template.sh to reflect pkg-config changes and x86_64 now being the default.
cairo, fontconfig: no more hacks needed for pkg-config happiness
zlib: link using a glob so we pull in libz.so.<version>, for -rpath-link to work.
libiconv: hush.
binutils: remove sed line that was needed in pre-2.23 binutils, that now breaks the build.
mesa: hush.
netsurf: hush.
openssl: upgrade to 1.0.1g, update patch for x86_64, force non-parallel build