runtime(make): syntax highlighting update for makeDefine

runtime(make): syntax highlighting update for makeDefine

Previously contents in makeDefine are nearly highlighted as Define, so
comments and targets shares the same color as Define, making it hard to
distinguish if someone write large block of targets-recipes as defined
function.

Such scenario is common in building data analysis pipeline. Recipes are
reused and targets may have multiple variables, and a single % implicit
rule is not enough.

closes: #18403

Signed-off-by: Yiyang Wu <xgreenlandforwyy@gmail.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>