graphics/pgplot: Unbreak build with GCC 10
Error: Type mismatch in argument 'pixmap' at (1); passed INTEGER(8) to INTEGER(1)
./drivers/gidriv.f:266:72:
266 | : CALL GRGI01(IX0, IY0, IX1, IY1, IC, BX, BY, %VAL(PIXMAP))
| 1Error: Type mismatch in argument 'pixmap' at (1); passed INTEGER(8) to INTEGER(1)
./drivers/gidriv.f:275:72:
275 | : CALL GRGI01(IX0, IY0, IX0, IY0, IC, BX, BY, %VAL(PIXMAP))
| 1Error: Type mismatch in argument 'pixmap' at (1); passed INTEGER(8) to INTEGER(1)
./drivers/gidriv.f:288:72:
288 | : %VAL(WORK))
| 1Error: Type mismatch in argument 'pixmap' at (1); passed INTEGER(8) to INTEGER(1)
./drivers/gidriv.f:367:72:
367 | : CALL GRGI03(IX0, IY0, IX1, IY1, IC, BX, BY, %VAL(PIXMAP))
| 1Error: Type mismatch in argument 'pixmap' at (1); passed INTEGER(8) to INTEGER(1)
./drivers/gidriv.f:378:72:
378 | CALL GRGI04(NBUF, RBUF, BX, BY, %VAL(PIXMAP), MAXIDX)
| 1Error: Type mismatch in argument 'pixmap' at (1); passed INTEGER(8) to INTEGER(1)
PR: 246700