compositor-drm: ignore case of {h,v}sync flags in modeline

Some modeline generators put out e.g. +HSync instead of +hsync. Accept
that too since it's not ambigous.

Signed-off-by: Guido Günther <agx@sigxcpu.org>
Reviewed-by: Pekka Paalanen <pekka.paalanen@collabora.co.uk>

libweston/compositor-drm.c

@@ -4341,16 +4341,16 @@ parse_modeline(const char *s, drmModeModeInfo *mode)
 		return -1;
 
 	mode->clock = fclock * 1000;
-	if (strcmp(hsync, "+hsync") == 0)
+	if (strcasecmp(hsync, "+hsync") == 0)
 		mode->flags |= DRM_MODE_FLAG_PHSYNC;
-	else if (strcmp(hsync, "-hsync") == 0)
+	else if (strcasecmp(hsync, "-hsync") == 0)
 		mode->flags |= DRM_MODE_FLAG_NHSYNC;
 	else
 		return -1;
 
-	if (strcmp(vsync, "+vsync") == 0)
+	if (strcasecmp(vsync, "+vsync") == 0)
 		mode->flags |= DRM_MODE_FLAG_PVSYNC;
-	else if (strcmp(vsync, "-vsync") == 0)
+	else if (strcasecmp(vsync, "-vsync") == 0)
 		mode->flags |= DRM_MODE_FLAG_NVSYNC;
 	else
 		return -1;