Description: Add extern to three functions for gcc-10 compatibility.
Author: Peter Michael Green <plugwash@raspbian.org>

--- a/modules/codec/omxil/omxil_core.h
+++ b/modules/codec/omxil/omxil_core.h
@@ -34,9 +34,9 @@ extern OMX_ERRORTYPE (*pf_component_enum
 extern OMX_ERRORTYPE (*pf_get_roles_of_component)(OMX_STRING, OMX_U32 *, OMX_U8 **);
 
 /* Extra IOMX android functions. Can be NULL if we don't link with libiomx */
-OMX_ERRORTYPE (*pf_enable_graphic_buffers)(OMX_HANDLETYPE, OMX_U32, OMX_BOOL);
-OMX_ERRORTYPE (*pf_get_graphic_buffer_usage)(OMX_HANDLETYPE, OMX_U32, OMX_U32*);
-OMX_ERRORTYPE (*pf_get_hal_format) (const char *, int *);
+extern OMX_ERRORTYPE (*pf_enable_graphic_buffers)(OMX_HANDLETYPE, OMX_U32, OMX_BOOL);
+extern OMX_ERRORTYPE (*pf_get_graphic_buffer_usage)(OMX_HANDLETYPE, OMX_U32, OMX_U32*);
+extern OMX_ERRORTYPE (*pf_get_hal_format) (const char *, int *);
 
 int InitOmxCore(vlc_object_t *p_this);
 void DeinitOmxCore(void);