runtime(syntax-tests): Retrofit input/c.c. with TEST_SETUP

Also:

- Include a syntax test for Markdown that takes advantage of
  a sourceable setup configuration.
- Update Filelist

closes: #14215

Signed-off-by: Aliaksei Budavei <0x000c70@gmail.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>

runtime/syntax/testdir/dumps/c_01.dump

@@ -1,9 +1,10 @@
-|#+0#e000e06#ffffff0| |i|n|c|l|u|d|e| |<+0#e000002&|c|y|g|w|i|n|/|v|e|r|s|i|o|n|.|h|>| +0#0000000&@46
+|#+0#e000e06#ffffff0|i|f|d|e|f| |_@1|C|Y|G|W|I|N|_@1| +0#0000000&@57
+|#+0#e000e06&| |i|n|c|l|u|d|e| |<+0#e000002&|c|y|g|w|i|n|/|v|e|r|s|i|o|n|.|h|>| +0#0000000&@46
 |#+0#e000e06&| |i|n|c|l|u|d|e| |<+0#e000002&|s|y|s|/|c|y|g|w|i|n|.|h|>| +0#0000000&@7|/+0#0000e05&@1| |f|o|r| |c|y|g|w|i|n|_|c|o|n|v|_|t|o|_|p|o|s|i|x|_|p|a|t|h|(|)| |a|n|d|/|o|r| +0#0000000&@1
 @32|/+0#0000e05&@1| |c|y|g|w|i|n|_|c|o|n|v|_|p|a|t|h|(|)| +0#0000000&@21
 |#+0#e000e06&| |i|n|c|l|u|d|e| |<+0#e000002&|l|i|m|i|t|s|.|h|>| +0#0000000&@54
-|#+0#e000e06&|e|n|d|i|f| +0#0000000&@68
-> @74
+>#+0#e000e06&|e|n|d|i|f| +0#0000000&@68
+@75
 |#+0#e000e06&|i|f| |d|e|f|i|n|e|d|(|M|S|W|I|N|)| |&@1| |(|!|d|e|f|i|n|e|d|(|F|E|A|T|_|G|U|I|_|M|S|W|I|N|)| ||@1| |d|e|f|i|n|e|d|(|V|I|M|D|L@1|)@1| +0#0000000&@7
 |#+0#e000e06&| |i|n|c|l|u|d|e| |"+0#e000002&|i|s|c|y|g|p|t|y|.|h|"| +0#0000000&@52
 |#+0#e000e06&|e|n|d|i|f| +0#0000000&@68
@@ -16,5 +17,4 @@
 |#+0#e000e06&|d|e|f|i|n|e| |E|D|I|T|_|T|A|G| @3|3+0#e000002&| +0#e000e06&@6|/+0#0000e05&@1| |t|a|g| |n|a|m|e| |a|r|g|u|m|e|n|t| |g|i|v|e|n|,| |u|s|e| |t|a|g|n|a|m|e| +0#0000000&@7
 |#+0#e000e06&|d|e|f|i|n|e| |E|D|I|T|_|Q|F| @4|4+0#e000002&| +0#e000e06&@6|/+0#0000e05&@1| |s|t|a|r|t| |i|n| |q|u|i|c|k|f|i|x| |m|o|d|e| +0#0000000&@21
 @75
-|#+0#e000e06&|i|f| |(|d|e|f|i|n|e|d|(|U|N|I|X|)| ||@1| |d|e|f|i|n|e|d|(|V|M|S|)@1| |&@1| |!|d|e|f|i|n|e|d|(|N|O|_|V|I|M|_|M|A|I|N|)| +0#0000000&@14
-@57|1|9|,|0|-|1| @7|1|2|%| 
+@57|1|9|,|1| @9|1|2|%|