Update runtime files

runtime/syntax/pamenv.vim

@@ -0,0 +1,28 @@
+" Vim syntax file
+" Language:             pam_env.conf(5) configuration file
+" Latest Revision:      2020-05-10
+
+if exists("b:current_syntax")
+  finish
+endif
+
+syn keyword     pamenvTodo              contained TODO FIXME XXX NOTE
+syn region      pamenvComment           start='^#' end='$' display oneline contains=pamenvTodo,@Spells
+
+syn match       pamenvVars              '^[A-Z_][A-Z_0-9]*' nextgroup=pamenvKeywords skipwhite
+
+syn keyword     pamenvKeywords          contained DEFAULT OVERRIDE nextgroup=pamenvVarEq
+
+syn match       pamenvVarEq             contained '=' nextgroup=pamenvValue,pamenvValueWithQuote
+
+syn match       pamenvValue             contained '[^ \t]*' skipwhite nextgroup=pamenvKeywords
+syn region      pamenvValueWithQuote    contained start='"' end='"' skipwhite nextgroup=pamenvKeywords
+
+hi def link     pamenvTodo              Todo
+hi def link     pamenvComment           Comment
+hi def link     pamenvKeywords          Keyword
+hi def link     pamenvVars              Identifier
+hi def link     pamenvValue             String
+hi def link     pamenvValueWithQuote    String
+
+let b:current_syntax = "pamenv"