added file extensions when glossaries is loaded with "symbols" option

TeX.gitignore

@@ -111,6 +111,9 @@ acs-*.bib
 *.glsdefs
 *.lzo
 *.lzs
+*.slg
+*.slo
+*.sls
 
 # uncomment this for glossaries-extra (will ignore makeindex's style files!)
 # *.ist