sci-misc/boinc: cleanup curl_ssl_nss cruft

curl removed this upstream a few releases ago, and all releases are now gone from
::gentoo.

This one is less important but may as well do it now while I remember.

Signed-off-by: Sam James <sam@gentoo.org>

sci-misc/boinc/boinc-7.22.0-r1.ebuild

@@ -42,7 +42,7 @@ DEPEND="
 		virtual/opencl
 	)
 	dev-libs/openssl:=
-	net-misc/curl[curl_ssl_gnutls(-)=,-curl_ssl_nss(-),curl_ssl_openssl(-)=,-curl_ssl_axtls(-),-curl_ssl_cyassl(-)]
+	net-misc/curl[curl_ssl_gnutls(-)=,curl_ssl_openssl(-)=,-curl_ssl_axtls(-),-curl_ssl_cyassl(-)]
 	sys-libs/zlib
 	X? (
 		dev-libs/glib:2

sci-misc/boinc/boinc-7.24.1-r1.ebuild

@@ -36,7 +36,7 @@ DEPEND="
 	acct-user/boinc
 	app-misc/ca-certificates
 	dev-libs/openssl:=
-	net-misc/curl[curl_ssl_gnutls(-)=,-curl_ssl_nss(-),curl_ssl_openssl(-)=,-curl_ssl_axtls(-),-curl_ssl_cyassl(-)]
+	net-misc/curl[curl_ssl_gnutls(-)=,curl_ssl_openssl(-)=,-curl_ssl_axtls(-),-curl_ssl_cyassl(-)]
 	sys-libs/zlib
 	cuda? (
 		x11-drivers/nvidia-drivers

sci-misc/boinc/boinc-9999.ebuild

@@ -44,7 +44,7 @@ DEPEND="
 		virtual/opencl
 	)
 	dev-libs/openssl:=
-	net-misc/curl[curl_ssl_gnutls(-)=,-curl_ssl_nss(-),curl_ssl_openssl(-)=,-curl_ssl_axtls(-),-curl_ssl_cyassl(-)]
+	net-misc/curl[curl_ssl_gnutls(-)=,curl_ssl_openssl(-)=,-curl_ssl_axtls(-),-curl_ssl_cyassl(-)]
 	sys-apps/util-linux
 	sys-libs/zlib
 	X? (