Added the appropriate #! magic at the beginning of shell scripts. (Some modern shells don't like scripts to be without it.)

util/ceg/defaults/argtype

@@ -1,3 +1,4 @@
+#!/bin/sh
 : argtype lists all em mnemonics that have an argument type equal to
 : one of the letters specified in the argument
 case x$# in

util/ceg/defaults/m_C_mnem

@@ -1,3 +1,5 @@
+#!/bin/sh
+
 EM_TABLE=$1
 argtype=$2
 echo "switch(p->em_opcode) {"