Make ignoring .ist files for glossaries-extra ... (#3066)

package not interfere with makeindex's style files

TeX.gitignore

@@ -110,6 +110,9 @@ acs-*.bib
 *.gls
 *.glsdefs
 
+# uncomment this for glossaries-extra (will ignore makeindex's style files!)
+# *.ist
+
 # gnuplottex
 *-gnuplottex-*
 
@@ -259,6 +262,3 @@ TSWLatexianTemp*
 
 # standalone packages
 *.sta
-
-# glossaries-extra
-*.ist