patch 9.1.0583: filetype: *.pdf_tex files are not recognized

Problem:  filetype: *.pdf_tex files are not recognized
Solution: Detect '*.pdf_tex' files as tex filetype
          (Jonas Dujava)

Those files are generated by inkscape, when exporting, see e.g.
https://inkscape.org/doc/inkscape-man.html

closes: #15250

Signed-off-by: Jonas Dujava <jonas.dujava@gmail.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/src/version.c b/src/version.c
index ab317d3..6633b7b 100644
--- a/src/version.c
+++ b/src/version.c
@@ -705,6 +705,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    583,
+/**/
     582,
 /**/
     581,