Support patches for TruffleRuby too

README.md

@@ -86,8 +86,8 @@ The build process may be configured through the following environment variables:
 #### Applying Patches
 
 Both `rbenv install` and `ruby-build` support the `--patch` (`-p`) flag to apply
-a patch to the Ruby (/JRuby/Rubinius) source code before building. Patches are
-read from `STDIN`:
+a patch to the Ruby (/JRuby/Rubinius/TruffleRuby) source code before building.
+Patches are read from `STDIN`:
 
 ```sh
 # applying a single patch

bin/ruby-build

@@ -1154,7 +1154,7 @@ isolated_gem_install() {
 apply_ruby_patch() {
   local patchfile
   case "$1" in
-  ruby-* | jruby-* | rubinius-* )
+  ruby-* | jruby-* | rubinius-* | truffleruby-* )
     patchfile="$(mktemp "${TMP}/ruby-patch.XXXXXX")"
     cat "${2:--}" >"$patchfile"