Revert "nettle: build as static library"

This reverts commit 4fbda399db78166ffccaf654aa465a5e3f02bc47.

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

This reverts commit 181298ca03cdbcb8c67c509f56d9447e13bc58d8.