patch 9.0.1587: Corn config files are not recognized

Problem:    Corn config files are not recognized.
Solution:   Add a pattern for Corn config files. (Jake Stanger, closes #12449)
diff --git a/src/testdir/test_filetype.vim b/src/testdir/test_filetype.vim
index c2b4cc7..9375883 100644
--- a/src/testdir/test_filetype.vim
+++ b/src/testdir/test_filetype.vim
@@ -126,6 +126,7 @@
     \ 'confini': ['/etc/pacman.conf', 'any/etc/pacman.conf', 'mpv.conf', 'any/.aws/config', 'any/.aws/credentials', 'file.nmconnection'],
     \ 'context': ['tex/context/any/file.tex', 'file.mkii', 'file.mkiv', 'file.mkvi', 'file.mkxl', 'file.mklx'],
     \ 'cook': ['file.cook'],
+    \ 'corn': ['file.corn'],
     \ 'cpon': ['file.cpon'],
     \ 'cpp': ['file.cxx', 'file.c++', 'file.hh', 'file.hxx', 'file.hpp', 'file.ipp', 'file.moc', 'file.tcc', 'file.inl', 'file.tlh', 'file.cppm', 'file.ccm', 'file.cxxm', 'file.c++m'],
     \ 'cqlang': ['file.cql'],
diff --git a/src/version.c b/src/version.c
index fdb7716..08c67bb 100644
--- a/src/version.c
+++ b/src/version.c
@@ -696,6 +696,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1587,
+/**/
     1586,
 /**/
     1585,