fix(runtime): do not allow breakcheck inside runtime path calculation

problem: breakcheck might run arbitrary lua code, which might require
modules and thus invoke runtime path calculation recursively.
solution: Block the use of breakcheck when expanding glob patterns
inside 'runtimepath'

fixes #23012

src/nvim/path.h

@@ -26,6 +26,7 @@
 #define EW_DODOT        0x4000   // also files starting with a dot
 #define EW_EMPTYOK      0x8000   // no matches is not an error
 #define EW_NOTENV       0x10000  // do not expand environment variables
+#define EW_NOBREAK      0x20000  // do not invoke breakcheck
 
 /// Return value for the comparison of two files. Also @see path_full_compare.
 typedef enum file_comparison {