patch 9.0.0088: pattern for detecting bitbake files is not sufficient

Problem:    Pattern for detecting bitbake files is not sufficient.
Solution:   Adjust the pattern. (Gregory Anders, closes #10743)
diff --git a/src/testdir/test_filetype.vim b/src/testdir/test_filetype.vim
index ea7bf3e..0104fdb 100644
--- a/src/testdir/test_filetype.vim
+++ b/src/testdir/test_filetype.vim
@@ -1864,6 +1864,31 @@
   call assert_equal('bitbake', &filetype)
   bwipe!
 
+  call writefile(['S = "${WORKDIR}"'], 'Xfile.inc')
+  split Xfile.inc
+  call assert_equal('bitbake', &filetype)
+  bwipe!
+
+  call writefile(['DEPENDS:append = " somedep"'], 'Xfile.inc')
+  split Xfile.inc
+  call assert_equal('bitbake', &filetype)
+  bwipe!
+
+  call writefile(['MACHINE ??= "qemu"'], 'Xfile.inc')
+  split Xfile.inc
+  call assert_equal('bitbake', &filetype)
+  bwipe!
+
+  call writefile(['PROVIDES := "test"'], 'Xfile.inc')
+  split Xfile.inc
+  call assert_equal('bitbake', &filetype)
+  bwipe!
+
+  call writefile(['RDEPENDS_${PN} += "bar"'], 'Xfile.inc')
+  split Xfile.inc
+  call assert_equal('bitbake', &filetype)
+  bwipe!
+
   " asm
   call writefile(['asmsyntax=foo'], 'Xfile.inc')
   split Xfile.inc
diff --git a/src/version.c b/src/version.c
index 75fe0ed..7c58424 100644
--- a/src/version.c
+++ b/src/version.c
@@ -736,6 +736,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    88,
+/**/
     87,
 /**/
     86,