Remove sha1 hashing from OpenZFS, it's not used anywhere.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Attila Fülöp <attila@fueloep.org>
Signed-off-by: Tino Reichardt <milky-zfs@mcmilk.de>
Signed-off-by: Ahelenia Ziemiańska <nabijaczleweli@nabijaczleweli.xyz>
Closes #12895
Closes #12902

module/icp/illumos-crypto.c

@@ -110,7 +110,6 @@ icp_fini(void)
 {
 	skein_mod_fini();
 	sha2_mod_fini();
-	sha1_mod_fini();
 	aes_mod_fini();
 	kcf_sched_destroy();
 	kcf_prov_tab_destroy();
@@ -139,7 +138,6 @@ icp_init(void)
 
 	/* initialize algorithms */
 	aes_mod_init();
-	sha1_mod_init();
 	sha2_mod_init();
 	skein_mod_init();