Simplify logic for mkmf's try_link

Author: eregon

lib/mri/mkmf.rb

@@ -2887,19 +2887,11 @@ def MAIN_DOES_NOTHING(*refs)
     "$(CFLAGS) $(src) $(LIBPATH) $(LDFLAGS) $(ARCH_FLAG) $(LOCAL_LIBS) $(LIBS)"
 
   if defined?(::TruffleRuby)
-    # We need to link to libtruffleruby for MakeMakefile#try_link to succeed.
-    # The created executable will link against both libgraalvm-llvm.so and libtruffleruby and
-    # might be executed for #try_constant and #try_run so we also need -rpath for both.
-    # TODO: could likely always use the second branch here
-    if Truffle::Boot.get_option('cexts-sulong')
-      libtruffleruby_dir = File.dirname(RbConfig::CONFIG['libtruffleruby'])
-      TRY_LINK << " -L#{libtruffleruby_dir} -rpath #{libtruffleruby_dir} -ltruffleruby"
-      libgraalvm_llvm_dir = ::Truffle::Boot.toolchain_paths(:LD_LIBRARY_PATH)
-      TRY_LINK << " -rpath #{libgraalvm_llvm_dir}"
-    else
-      libtrufflerubytrampoline_dir = File.dirname(RbConfig::CONFIG['libtrufflerubytrampoline'])
-      TRY_LINK << " -L#{libtrufflerubytrampoline_dir} -Wl,-rpath,#{libtrufflerubytrampoline_dir} -ltrufflerubytrampoline"
-    end
+    # We need to link to libtrufflerubytrampoline for MakeMakefile#try_link to succeed.
+    # The created executable will link against libtrufflerubytrampoline and
+    # might be executed for #try_constant and #try_run so we also need -rpath.
+    libtrufflerubytrampoline_dir = File.dirname(RbConfig::CONFIG['libtrufflerubytrampoline'])
+    TRY_LINK << " -L#{libtrufflerubytrampoline_dir} -Wl,-rpath,#{libtrufflerubytrampoline_dir} -ltrufflerubytrampoline"
   end
 
   ##