patch 9.0.0443: blueprint files are not recognized

Problem:    Blueprint files are not recognized.
Solution:   Add a pattern for blueprint files. (Gabriele Musco, closes #11107)

runtime/filetype.vim

@@ -2579,6 +2579,8 @@ au BufNewFile,BufRead *.txt
 	\|   setf text
 	\| endif
 
+" Blueprint markup files
+au BufNewFile,BufRead *.blp			setf blueprint
 
 " Use the filetype detect plugins.  They may overrule any of the previously
 " detected filetypes.

src/testdir/test_filetype.vim

@@ -88,6 +88,7 @@ let s:filename_checks = {
     \ 'bindzone': ['named.root', '/bind/db.file', '/named/db.file', 'any/bind/db.file', 'any/named/db.file'],
     \ 'bitbake': ['file.bb', 'file.bbappend', 'file.bbclass', 'build/conf/local.conf', 'meta/conf/layer.conf', 'build/conf/bbappend.conf', 'meta-layer/conf/distro/foo.conf'],
     \ 'blank': ['file.bl'],
+    \ 'blueprint': ['file.blp'],
     \ 'bsdl': ['file.bsd', 'file.bsdl'],
     \ 'bst': ['file.bst'],
     \ 'bzl': ['file.bazel', 'file.bzl', 'WORKSPACE'],

src/version.c

@@ -703,6 +703,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    443,
 /**/
     442,
 /**/