patch 9.1.0749: filetype: http files not recognized

Problem:  filetype: http files not recognized
Solution: detect '*.http' as http filetype, include
          http filetype plugin (Riley Bruins)

Based on the specification found
[here](https://github.com/JetBrains/http-request-in-editor-spec/blob/master/spec.md)

closes: #15762

Signed-off-by: Riley Bruins <ribru17@hotmail.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/src/testdir/test_filetype.vim b/src/testdir/test_filetype.vim
index 61272ec..a780002 100644
--- a/src/testdir/test_filetype.vim
+++ b/src/testdir/test_filetype.vim
@@ -340,6 +340,7 @@
     hostsaccess: ['/etc/hosts.allow', '/etc/hosts.deny', 'any/etc/hosts.allow', 'any/etc/hosts.deny'],
     # file.component.html should be HTML, not Angular, see #13594
     html: ['file.html', 'file.htm', 'file.cshtml', 'file.component.html'],
+    http: ['file.http'],
     htmlm4: ['file.html.m4'],
     httest: ['file.htt', 'file.htb'],
     hurl: ['file.hurl'],
diff --git a/src/version.c b/src/version.c
index fd67af6..d136150 100644
--- a/src/version.c
+++ b/src/version.c
@@ -705,6 +705,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    749,
+/**/
     748,
 /**/
     747,