glsl2: Use bison command line option to set prefix

Bison version 2.3 doesn't seem to support %name-prefix in the source.

This should fix bugzilla #29207.

src/glsl/Makefile

@@ -154,7 +154,7 @@ glsl_lexer.cpp: glsl_lexer.lpp
 	flex --never-interactive --outfile="$@"  $<
 
 glsl_parser.cpp: glsl_parser.ypp
-	bison -v -o "$@" --defines=glsl_parser.h $<
+	bison -v -o "$@" -p "_mesa_glsl_" --defines=glsl_parser.h $<
 
 glcpp/glcpp-lex.c: glcpp/glcpp-lex.l
 	flex --never-interactive --outfile="$@" $<

src/glsl/glsl_parser.ypp

@@ -48,7 +48,6 @@
 
 %lex-param   {void *scanner}
 %parse-param {struct _mesa_glsl_parse_state *state}
-%name-prefix "_mesa_glsl_"
 
 %union {
    int n;