patch 9.1.0302: filetype: blueprint files are not recognized

Problem:  filetype: blueprint files are not recognized
Solution: Detect '*.bp' files as blueprint files, add
          a minimal filetype plugin (Bruno Belanyi)

See: https://source.android.com/docs/setup/build

closes: #14488

Signed-off-by: Bruno BELANYI <bruno@belanyi.fr>
Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/runtime/ftplugin/bp.vim b/runtime/ftplugin/bp.vim
new file mode 100644
index 0000000..cb925cb
--- /dev/null
+++ b/runtime/ftplugin/bp.vim
@@ -0,0 +1,14 @@
+" Blueprint build system filetype plugin file
+" Language: Blueprint
+" Maintainer: Bruno BELANYI <bruno.vim@belanyi.fr>
+" Latest Revision: 2024-04-10
+
+if exists("b:did_ftplugin")
+  finish
+endif
+let b:did_ftplugin = 1
+
+setlocal comments=b:#
+setlocal commentstring=#\ %s
+
+let b:undo_ftplugin = "setlocal comments< commentstring<"