Check for shaders without closing brace

Shaders without closing brace can eat shaders in other files.
Pass depth to SkipBracedSection instead of reparsing text as it messed up parse line numbers.

code/qcommon/q_shared.h

@@ -752,7 +752,7 @@ typedef struct pc_token_s
 
 void	COM_MatchToken( char**buf_p, char *match );
 
-void SkipBracedSection (char **program);
+qboolean SkipBracedSection (char **program, int depth);
 void SkipRestOfLine ( char **data );
 
 void Parse1DMatrix (char **buf_p, int x, float *m);