dev-ruby/rdoc: avoid running tools through bundler

This is not needed for us and brings in unwanted dependencies. Use the
correct ruby interpreter instead.

Fixes: https://bugs.gentoo.org/963848
Signed-off-by: Hans de Graaff <graaff@gentoo.org>

dev-ruby/rdoc/rdoc-6.15.0.ebuild

@@ -68,6 +68,11 @@ all_ruby_prepare() {
 		-i ${RUBY_FAKEGEM_GEMSPEC} || die
 }
 
+each_ruby_prepare() {
+	sed -e "/sh/ s:\"bundle\", \"exec\", :\"${RUBY}\", \"-S\", :" \
+		-i Rakefile || die
+}
+
 all_ruby_compile() {
 	all_fakegem_compile