victor9k: Remove unreferenced class member which was causing a build

failure with clang.

Author: donohoe00

src/mame/act/victor9k_fdc.h

@@ -121,8 +121,6 @@ class victor_9000_fdc_device :  public device_t
 	void load1_cb(floppy_image_device *device);
 	void unload1_cb(floppy_image_device *device);
 
-	uint8_t m_p2;
-
 	/* floppy state */
 	int m_via_rdy0;
 	int m_via_rdy1;