dri: use unsigned char instead of GLboolean

GL datatypes have been removed in upstream mesa dri_interface.h

TEST=Build minigbm with amdgpu enabled.

Change-Id: I31a89ad806b52352433d055982eff83bd0aeac39
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/minigbm/+/3352528
Reviewed-by: Dominik Behr <dbehr@chromium.org>
Reviewed-by: Yiwei Zhang <zzyiwei@chromium.org>
Tested-by: Yiwei Zhang <zzyiwei@chromium.org>
Auto-Submit: Dominik Behr <dbehr@chromium.org>
Commit-Queue: Dominik Behr <dbehr@chromium.org>
diff --git a/dri.c b/dri.c
index 4ee133d..ea8c757 100644
--- a/dri.c
+++ b/dri.c
@@ -459,7 +459,7 @@
 	uint64_t planes;
-	GLboolean ret = dri->image_extension->queryDmaBufFormatModifierAttribs(
+	unsigned char ret = dri->image_extension->queryDmaBufFormatModifierAttribs(
 	    dri->device, format, modifier, __DRI_IMAGE_FORMAT_MODIFIER_ATTRIB_PLANE_COUNT, &planes);
 	if (!ret)
 		return 0;