runtime(make): fix wrong highlighting with $ inside double quotes

fixes: #19986

Co-authored-by: Anton Khirnov <anton@khirnov.net>
Signed-off-by: Christian Brabandt <cb@256bit.org>

runtime/syntax/make.vim

@@ -9,6 +9,7 @@
 " 2025 Oct 25 by Vim project: update makeTargetinDefine highlighting (#18570)
 " 2025 Dec 23 by Vim project: fix too greedy match (#18938)
 " 2025 Dec 23 by Vim project: wrong highlight with paranthesis inside quotes (#18818)
+" 2026 Apr 17 by Vim project: wrong highlight $ inside quotes (#19986)
 
 " quit when a syntax file was already loaded
 if exists("b:current_syntax")
@@ -41,7 +42,7 @@ endif
 syn match makeIdent	"\$\$\w*"
 syn match makeIdent	"\$\$\$\$\w*" containedin=makeDefine
 syn match makeIdent	"\$[^({]"
-syn match makeIdent	"\$\$[^({]" containedin=makeDefine
+syn match makeIdent	"\$\$[^({\"']" containedin=makeDefine
 if get(b:, 'make_flavor', s:make_flavor) == 'microsoft'
   syn region makeIdent	start="\$(" end=")" contains=makeStatement,makeIdent,makeDString,makeSString
   syn region makeIdent	start="\${" end="}" contains=makeStatement,makeIdent,makeDString,makeSString

runtime/syntax/testdir/dumps/make_01_00.dump

@@ -14,7 +14,7 @@
 @75
 |d+0#00e0e07&|e|f|a|u|l|t|:| +0#0000000&@66
 | +0#e000002&@7|$+0#00e0e07&|(|c+0#af5f00255&|a|l@1| +0#00e0e07&|s|a|y|,|"+0#e000002&|H|e|l@1|o| |(|w|o|r|l|d|)|!|"|)+0#00e0e07&| +0#0000000&@38
-|~+0#4040ff13&| @73
-|~| @73
-|~| @73
-| +0#0000000&@56|1|,|1| @10|A|l@1| 
+@75
+|f+0#00e0e07&|o@1|:| +0#0000000&@70
+| +0#e000002&@7|e|c|h|o| |"|b|a|r|$+0#00e0e07&@1|"+0#e000002&| |b|a|z| +0#0000000&@50
+@57|1|,|1| @10|A|l@1| 

runtime/syntax/testdir/input/make_01.mak

@@ -14,3 +14,6 @@ endef
 
 default:
 	$(call say,"Hello (world)!")
+
+foo:
+	echo "bar$$" baz