Fix compile warnings in vtkParse.tab.c.

These are primarily due to the fact that vtkParse.tab.c is now a
bison GLR parser, since the wrapper-parse-cpp11 topic was merged.
- yyfill(), yyfillin() had attribute "unused", caused a clang warning.
- YYLTYPE's yydummy field gave "unitialized" warnings on gcc.

Change-Id: I68241a59cf7dd1b9925052921683b47088bbe8d8
Fix accidental modification of preproc_uint_t definition.

Change-Id: I269688640fc5d899f3e8e461078dfed19ba900e7
Merge topic 'vtkparse-warnings' into master

665da829 Fix accidental modification of preproc_uint_t definition.
4434962a Fix compile warnings in vtkParse.tab.c.