Include scrypt.h in Makefile.

Makefile.am

@@ -46,7 +46,7 @@ cgminer_SOURCES += adl.c adl.h adl_functions.h
 cgminer_SOURCES += *.cl
 
 if HAS_SCRYPT
-cgminer_SOURCES += scrypt.c
+cgminer_SOURCES += scrypt.c scrypt.h
 endif
 
 if HAS_CPUMINE