Fix crash on musl and clean up dependency

src/process_pipeline.c

@@ -14,7 +14,6 @@
 
 #include "gl_util.h"
 #include <sys/mman.h>
-#include <drm/drm_fourcc.h>
 
 #define TIFFTAG_FORWARDMATRIX1 50964
 

src/zbar_pipeline.c

@@ -184,7 +184,7 @@ process_image(MPPipeline *pipeline, MPZBarImage **_image)
 	zbar_image_t *zbar_image = zbar_image_create();
 	zbar_image_set_format(zbar_image, zbar_fourcc('Y', '8', '0', '0'));
 	zbar_image_set_size(zbar_image, width, height);
-	zbar_image_set_data(zbar_image, data, width * height * sizeof(uint8_t), zbar_image_free_data);
+	zbar_image_set_data(zbar_image, data, width * height * sizeof(uint8_t), NULL);
 
 	int res = zbar_scan_image(scanner, zbar_image);
 	assert(res >= 0);