patch 8.1.1308: the Normal highlight is not defined when compiled with GUI

Problem:    The Normal highlight is not defined when compiled with GUI.
Solution:   Always define Normal. (Christian Brabandt, closes #4072)
diff --git a/runtime/doc/syntax.txt b/runtime/doc/syntax.txt
index c3ce75c..1eca1c5 100644
--- a/runtime/doc/syntax.txt
+++ b/runtime/doc/syntax.txt
@@ -5002,6 +5002,8 @@
 		text (see 'conceallevel')
 							*hl-Cursor*
 Cursor		the character under the cursor
+lCursor		the character under the cursor when |language-mapping|
+		is used (see 'guicursor')
 							*hl-CursorIM*
 CursorIM	like Cursor, but used when in IME mode |CursorIM|
 							*hl-CursorColumn*
diff --git a/src/syntax.c b/src/syntax.c
index 537794a..0949145 100644
--- a/src/syntax.c
+++ b/src/syntax.c
@@ -6865,6 +6865,7 @@
     "lCursor guibg=fg guifg=bg", /* should be different, but what? */
 #endif
     "default link QuickFixLine Search",
+    CENT("Normal cterm=NONE", "Normal gui=NONE"),
     NULL
 };
 
@@ -6946,9 +6947,6 @@
 #endif
     CENT("MatchParen term=reverse ctermbg=Cyan",
 	 "MatchParen term=reverse ctermbg=Cyan guibg=Cyan"),
-#ifdef FEAT_GUI
-    "Normal gui=NONE",
-#endif
 #ifdef FEAT_TERMINAL
     CENT("StatusLineTerm term=reverse,bold cterm=bold ctermfg=White ctermbg=DarkGreen",
 	 "StatusLineTerm term=reverse,bold cterm=bold ctermfg=White ctermbg=DarkGreen gui=bold guifg=bg guibg=DarkGreen"),
@@ -7042,9 +7040,6 @@
     CENT("Conceal ctermbg=DarkGrey ctermfg=LightGrey",
 	 "Conceal ctermbg=DarkGrey ctermfg=LightGrey guibg=DarkGrey guifg=LightGrey"),
 #endif
-#ifdef FEAT_GUI
-    "Normal gui=NONE",
-#endif
 #ifdef FEAT_TERMINAL
     CENT("StatusLineTerm term=reverse,bold cterm=bold ctermfg=Black ctermbg=LightGreen",
 	 "StatusLineTerm term=reverse,bold cterm=bold ctermfg=Black ctermbg=LightGreen gui=bold guifg=bg guibg=LightGreen"),
diff --git a/src/testdir/test_highlight.vim b/src/testdir/test_highlight.vim
index e16abf1..24379d6 100644
--- a/src/testdir/test_highlight.vim
+++ b/src/testdir/test_highlight.vim
@@ -572,3 +572,10 @@
   call StopVimInTerminal(buf)
   call delete('Xtest_cursorline_with_visualmode')
 endfunc
+
+func Test_1_highlight_Normalgroup_exists()
+  " This test must come before the Test_cursorline test, as it appears this
+  " defines the Normal highlighting group anyway.
+  let hlNormal = HighlightArgs('Normal')
+  call assert_match('hi Normal\s*clear', hlNormal)
+endfunc
diff --git a/src/version.c b/src/version.c
index ea04ff9..63cfd8d 100644
--- a/src/version.c
+++ b/src/version.c
@@ -768,6 +768,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1308,
+/**/
     1307,
 /**/
     1306,