rb-sass-embedded: use precompiled platform gems

The source gem downloads a dart-sass binary during the build phase
anyway, so use the precompiled platform gems to avoid that.

Fixes: https://trac.macports.org/ticket/74205

ruby/rb-sass-embedded/Portfile

@@ -5,6 +5,7 @@ PortGroup           ruby 1.0
 
 ruby.branches       3.4 3.3 3.2 3.1
 ruby.setup          sass-embedded 1.101.0 gem {} rubygems
+revision            1
 categories-append   www
 license             MIT
 maintainers         nomaintainer
@@ -12,9 +13,28 @@ description         Use Dart Sass compiler from Ruby
 long_description    A Ruby library that will communicate with the Dart Sass \
                     compiler using the Embedded Sass protocol.
 homepage            https://github.com/sass-contrib/sass-embedded-host-ruby
-checksums           rmd160  c7e0b4abf893245fdc00d3690c628e179977de8f \
-                    sha256  57dbc3409e2c0a2c581a4c9945c2bd72ec88e71ec98017bd02dd1da8a76b22f4 \
-                    size    1046528
+
+# The source gem builds a native extension whose Rakefile downloads the
+# dart-sass binary from GitHub at build time
+# (https://trac.macports.org/ticket/74205).
+# Since we need a binary anyway, use the precompiled platform gems
+# instead so that we do not fetch during the build phase.
+supported_archs     x86_64 arm64
+universal_variant   no
+
+if {${configure.build_arch} eq "arm64"} {
+    set gem_platform    arm64-darwin
+    checksums           rmd160  f72de88f3c6e9932b6b7a0cc62c8c0a11fb91cbc \
+                        sha256  9fed684380b49499dfc856aba0d026a0748f924bd78044ffff2bae1537aea73e \
+                        size    4178944
+} else {
+    set gem_platform    x86_64-darwin
+    checksums           rmd160  13a26cab12012463bba43e8de0fca9bcd6ff6f72 \
+                        sha256  20ff4afd7c052b3f8d7b4abe511e8114985a07dff7616750a43ee1fc2759fb28 \
+                        size    4410880
+}
+distname            sass-embedded-${version}-${gem_platform}
+worksrcdir          sass-embedded-${version}
 
 if {${name} ne ${subport}} {
     depends_run-append \