myzip/myunzip: Use .enc for encrypted files

Use .enc instead of .crypt, as the extension of encrypted files. This
is commonly used in openssl examples.
Signed-off-by: Cédric Marie <cedric@hjuvi.lautre.net>

scripts/myunzip

 #!/bin/sh
 
-# myunzip - Uncompress a .tar.xz[.crypt] file
+# myunzip - Uncompress a .tar.xz[.enc] file
 # This file is part of Painted Shell - Shell configuration and scripts.
 #
 # Written in 2013-2018 by Cédric Marie
@@ -35,7 +35,7 @@ shift $(($OPTIND - 1))
 option_crypt=0
 
 if [ "$1" = "" -o ! -f "$1" ]; then print_usage; exit 1; fi
-file=${1%.crypt}
+file=${1%.enc}
 if [ "$file" != "$1" ]; then
     option_crypt=1
     [ -e "$file" ] && printf "$file already exists\n" && exit 1

scripts/myzip

 #!/bin/sh
 
-# myzip - Compress a directory to .tar.xz[.crypt] file
+# myzip - Compress a directory to .tar.xz[.enc] file
 # This file is part of Painted Shell - Shell configuration and scripts.
 #
 # Written in 2013-2018 by Cédric Marie
@@ -47,7 +47,7 @@ else
 fi
 [ -e "$file" ] && printf "$file already exists\n" && exit 1
 if [ $option_crypt -eq 1 ]; then
-    output_file=${file}.crypt
+    output_file=${file}.enc
     [ -e "$output_file" ] && printf "$output_file already exists\n" && exit 1
 else
     output_file=$file