Revert rescue around internal realpath call on Solaris

Solaris CI still has a problem even with these commits, so it doesn't
appear to fix the issue.  Reverting both 84e8e2a39b
and bfd2f159f0.

load.c

@@ -1060,33 +1060,6 @@ rb_ext_ractor_safe(bool flag)
     GET_THREAD()->ext_config.ractor_safe = flag;
 }
 
-#ifdef __sun
-static VALUE
-required_feature__realpath(VALUE path)
-{
-    return rb_realpath_internal(Qnil, path, 1);
-}
-
-static VALUE
-required_feature_realpath_rescue(VALUE path, VALUE exc)
-{
-    return path;
-}
-
-static VALUE
-required_feature_realpath(VALUE path)
-{
-    return rb_rescue(required_feature__realpath, path,
-        required_feature_realpath_rescue, path);
-}
-#else
-static VALUE
-required_feature_realpath(VALUE path)
-{
-    return rb_realpath_internal(Qnil, path, 1);
-}
-#endif
-
 /*
  * returns
  *  0: if already loaded (false)
@@ -1138,7 +1111,7 @@ require_internal(rb_execution_context_t *ec, VALUE fname, int exception, bool wa
 		result = TAG_RETURN;
 	    }
             else if (RTEST(rb_hash_aref(realpaths,
-                                        realpath = required_feature_realpath(path)))) {
+                                        realpath = rb_realpath_internal(Qnil, path, 1)))) {
                 result = 0;
             }
 	    else {

test/ruby/test_process.rb

@@ -1732,6 +1732,9 @@ class TestProcess < Test::Unit::TestCase
   end
 
   def test_no_curdir
+    if /solaris/i =~ RUBY_PLATFORM
+      skip "Temporary skip to avoid CI failures after commit to use realpath on required files"
+    end
     with_tmpchdir {|d|
       Dir.mkdir("vd")
       status = nil