Further fix distdir for hexdump.c

Conflicts:
	Makefile.am

Makefile.am

@@ -5,6 +5,7 @@ EXTRA_DIST	= example.conf m4/gnulib-cache.m4 linux-usb-bfgminer \
 		  api-example.php miner.php	\
 		  API.class API.java api-example.c windows-build.txt \
 		  bitstreams/* README.FPGA README.RPC README.scrypt \
+		  hexdump.c \
                   api-example.py
 
 SUBDIRS		= lib ccan