runtime(make): Makefile highlighting breaks with ')' in string

runtime(make): Makefile highlighting breaks with ')' in string

Problem:  Makefile syntax highlighting incorrectly ends function calls
          when encountering ')' inside double or single quoted strings,
          causing incorrect highlighting for the remainder of the line.
Solution: Add makeDString and makeSString to the contains list for
          makeIdent regions. This allows strings to be recognized inside
          variable references and function calls.

fixes:  #18687
closes: #18818

Signed-off-by: Beleswar Prasad Padhi <beleswarprasad@gmail.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>