[pw] Remove this script

It doesn't work right on macOS and I never use it anyway.

zsh/func/pw

@@ -1,76 +0,0 @@
-#!/bin/zsh
-# vim:ft=zsh
-
-function _usage_pw
-{
-    cat <<EOF
-Usage: $1 [-c <num>] [-h] [-l <num>] [-s <set>]
-
-Password generator. Uses the system random data generator to produce passwords
-of the provided length.
-
-Arguments:
-    -c      Count. Number of passwords to generate. (default: 1)
-    -h      Help. This message.
-    -l      Length. Number of characters per password. (default: 16)
-    -s      Character set. Set of characters from which each character of a 
-            password is generated. (default: all)
-
-            alpha       Uppercase and lowercase ASCII characters (A-Za-z)
-            num         Numeric characters (0-9)
-            alnum       The above two sets combined
-            sym         Symbol set, including: ! @ # $ % ^ & *
-            xsym        Extended symbols. Above plus . ; : - + =
-            all         Alphanumeric and symbol sets above
-            xall        Alphanumeric and extended symbol sets above
-EOF
-}
-
-
-function pw
-{
-    local ALPHA_SET='A-Za-z'
-    local NUMERIC_SET='0-9'
-    local SYM_SET='!@#$%^&*'
-    local XSYM_SET="${SYM_SET}.;:-+="
-    local ALNUM_SET="${ALPHA_SET}${NUMERIC_SET}"
-    local ALL_SET="${ALNUM_SET}${SYM_SET}"
-    local XALL_SET="${ALNUM_SET}${XSYM_SET}"
-
-    local -i length=16 count=1
-    local charset="$ALL_SET"
-
-    while getopts 'c:hl:s:' opt; do
-        case $opt in
-            c) count=$OPTARG;;
-            h) _usage_pw $0; return 0;;
-            l) length=$OPTARG;;
-            s) case $OPTARG in
-                alpha) charset="$ALPHA_SET";;
-                num) charset="$NUMERIC_SET";;
-                alnum) charset="$ALNUM_SET";;
-                sym) charset="$SYM_SET";;
-                xsym) charset="$XSYM_SET";;
-                all) charset="$ALL_SET";;
-                xall) charset="$XALL_SET";;
-                *) echo "Invalid set name: $OPTARG" 1>&2; return -2;;
-            esac
-            ;;
-            *) echo "Invalid argument: $opt" 1>&2; return -1;;
-        esac
-    done
-
-    local cmd='tr -dc "$charset" < /dev/urandom | fold -w $length | head -n $count'
-
-    if [[ $SYS == 'darwin' ]]; then
-        # The way OS X >=10.6 handles unicode characters causes tr to fail with an
-        # 'Illegal byte sequence' error. Setting the locale here fixes that.
-        #
-        # See: http://nerdbynature.de/s9y/?176
-        cmd="LC_CTYPE=C $cmd"
-    fi
-
-    eval "$cmd"
-}
-
-pw $@