rust: drop a block that should be redundant now

As discussed:
https://mail-index.netbsd.org/pkgsrc-changes/2026/02/12/msg340380.html

Author: dhgutteridge

lang/rust/options.mk

@@ -1,4 +1,4 @@
-# $NetBSD: options.mk,v 1.52 2026/02/12 01:35:36 gutteridge Exp $
+# $NetBSD: options.mk,v 1.53 2026/02/12 15:30:12 gutteridge Exp $
 
 PKG_OPTIONS_VAR=	PKG_OPTIONS.rust
 PKG_SUPPORTED_OPTIONS+=	rust-cargo-static rust-docs
@@ -86,9 +86,6 @@ CONFIGURE_ARGS+=	--enable-cargo-native-static
 BUILDLINK_API_DEPENDS.nghttp2+= nghttp2>=1.41.0
 BUILDLINK_API_DEPENDS.curl+= 	curl>=7.67.0
 .include "../../www/curl/buildlink3.mk"
-RUSTFLAGS+=     -C link-arg=-L${BUILDLINK_PREFIX.openssl}/lib
-RUSTFLAGS+=     -C link-arg=${COMPILER_RPATH_FLAG}${BUILDLINK_PREFIX.openssl}/lib
-MAKE_ENV+=	RUSTFLAGS=${RUSTFLAGS:Q}
 .include "../../security/openssl/buildlink3.mk"
 .endif