install: add indesym to --with-avail{-terse,}-output opt

Author: xdelaruelle

configure

@@ -371,15 +371,17 @@ Optional Packages:
   --with-avail-output=LIST
                           specify content to report on avail sub-command
                           regular output. elements accepted in LIST are:
-                          \`modulepath', \`alias', \`dirwsym', \`sym', \`tag',
-                          \`key', \`variant' and \`variantifspec' (elements in
-                          LIST are separated by \`:') [$availoutput]
+                          \`modulepath', \`alias', \`dirwsym', \`indesym',
+                          \`sym', \`tag', \`key', \`variant' and
+                          \`variantifspec' (elements in LIST are separated by
+                          \`:') [$availoutput]
   --with-avail-terse-output=LIST
                           specify content to report on avail sub-command
                           terse output. elements accepted in LIST are:
-                          \`modulepath', \`alias', \`dirwsym', \`sym', \`tag',
-                          \`key', \`variant' and \`variantifspec' (elements in
-                          LIST are separated by \`:') [$availterseoutput]
+                          \`modulepath', \`alias', \`dirwsym', \`indesym',
+                          \`sym', \`tag', \`key', \`variant' and
+                          \`variantifspec' (elements in LIST are separated by
+                          \`:') [$availterseoutput]
   --with-list-output=LIST
                           specify content to report on list sub-command
                           regular output. elements accepted in LIST are:
@@ -747,7 +749,7 @@ for arg in "$@"; do
       tagcolorname=$(get_package_value "$arg") ;;
    --with-avail-output*|--without-avail-output)
       availoutput=$(get_package_value "$arg" "$availoutput") ;
-      allowedval=" modulepath alias dirwsym sym tag key variant variantifspec " ;
+      allowedval=" modulepath alias dirwsym indesym sym tag key variant variantifspec " ;
       ORIG_IFS=$IFS ;
       IFS=: ;
       for val in $availoutput; do
@@ -759,7 +761,7 @@ for arg in "$@"; do
       IFS=$ORIG_IFS ;;
    --with-avail-terse-output*|--without-avail-terse-output)
       availterseoutput=$(get_package_value "$arg" "$availterseoutput") ;
-      allowedval=" modulepath alias dirwsym sym tag key variant variantifspec " ;
+      allowedval=" modulepath alias dirwsym indesym sym tag key variant variantifspec " ;
       ORIG_IFS=$IFS ;
       IFS=: ;
       for val in $availterseoutput; do