Revert "nettle: build as static library"

This reverts commit 0bb946ad071ca3cea358c5c3ce9816d711b73873.

Conflicts:
	packages/security/gnutls/meta
Revert "gmp: build as static library"

This reverts commit a4727ef6164f6c9ae268906fd6e0e94f43f4a58a.