dep: bump rake-compiler-dock to 1.8.0 (#3404)

**What problem is this PR intended to solve?**

Bump rake-compiler-dock to 1.8.0, see
https://github.com/rake-compiler/rake-compiler-dock/releases/tag/v1.8.0

.cross_rubies

@@ -1,21 +1,21 @@
-3.1.0:aarch64-linux-gnu
-3.1.0:aarch64-linux-musl
-3.1.0:arm-linux-gnu
-3.1.0:arm-linux-musl
-3.1.0:arm64-darwin
-3.1.0:x64-mingw-ucrt
-3.1.0:x86_64-darwin
-3.1.0:x86_64-linux-gnu
-3.1.0:x86_64-linux-musl
-3.2.0:aarch64-linux-gnu
-3.2.0:aarch64-linux-musl
-3.2.0:arm-linux-gnu
-3.2.0:arm-linux-musl
-3.2.0:arm64-darwin
-3.2.0:x64-mingw-ucrt
-3.2.0:x86_64-darwin
-3.2.0:x86_64-linux-gnu
-3.2.0:x86_64-linux-musl
+3.1.6:aarch64-linux-gnu
+3.1.6:aarch64-linux-musl
+3.1.6:arm-linux-gnu
+3.1.6:arm-linux-musl
+3.1.6:arm64-darwin
+3.1.6:x64-mingw-ucrt
+3.1.6:x86_64-darwin
+3.1.6:x86_64-linux-gnu
+3.1.6:x86_64-linux-musl
+3.2.6:aarch64-linux-gnu
+3.2.6:aarch64-linux-musl
+3.2.6:arm-linux-gnu
+3.2.6:arm-linux-musl
+3.2.6:arm64-darwin
+3.2.6:x64-mingw-ucrt
+3.2.6:x86_64-darwin
+3.2.6:x86_64-linux-gnu
+3.2.6:x86_64-linux-musl
 3.3.5:aarch64-linux-gnu
 3.3.5:aarch64-linux-musl
 3.3.5:arm-linux-gnu

Gemfile

@@ -11,7 +11,7 @@ group :development do
 
   # building extensions
   gem "rake-compiler", "1.2.8"
-  gem "rake-compiler-dock", "1.7.1"
+  gem "rake-compiler-dock", "1.8.0"
 
   # parser generator
   gem "rexical", "1.0.8"

ext/nokogiri/extconf.rb

@@ -627,7 +627,7 @@ def do_clean
 def needs_darwin_linker_hack
   config_cross_build? &&
     darwin? &&
-    Gem::Requirement.new("~> 3.2").satisfied_by?(Gem::Version.new(RbConfig::CONFIG["ruby_version"].split("+").first))
+    RbConfig::MAKEFILE_CONFIG["EXTDLDFLAGS"].include?("-bundle_loader")
 end
 
 #
@@ -764,10 +764,6 @@ def needs_darwin_linker_hack
   cross_build_p = config_cross_build?
   message "Cross build is #{cross_build_p ? "enabled" : "disabled"}.\n"
 
-  if needs_darwin_linker_hack
-    append_ldflags("-Wl,-flat_namespace")
-  end
-
   require "yaml"
   dependencies = YAML.load_file(File.join(PACKAGE_ROOT_DIR, "dependencies.yml"))