vimlol: highlight our maths constants F_PI, D_PI etc. in vim.

tools/vimlol/vimlol.vim

@@ -50,6 +50,11 @@ au Syntax cpp
    \ syn keyword cConstant
    \ nullptr
 
+" New maths constants
+au Syntax cpp
+   \ syn match cConstant
+   \ "\<\(F\|D\|LD\)_\(PI\|PI_[234]\|[12]_PI\|SQRT_[23]\|SQRT_1_2\)\>"
+
 
 """
 """ LolFx language handler