Fix addons shebang.

[brauliohms]

Follows fix shebangs in some files according to the packaging in Debian, because I am the maintainer of the package in Debian.

[Euro20179]

The script just sources the addons so the shebang is not very important, but if I'm going to merge this,
The #!/bin/sh shebangs should probably all just be #!/usr/bin/env sh. And scrapers/ani-category should use sh not bash

[brauliohms]

The script scrapers/ani-category in line 107, lintian indicates is not posix, is a bash script.

[brauliohms]

Follow the lintian msg:

bash-term-in-posix-shell '(ep_start+=' [usr/share/ytfzf/addons/scrapers/ani-category:107]

This script is marked as running under /bin/sh, but it seems to use a feature found in bash but not in the SUSv3 or POSIX shell specification.

[Euro20179]

According to this which I've used as a posix reference for this script, += inside arithmetic expansion is posix compliant.

Next, the shell shall treat this as an arithmetic expression and substitute the value of the expression. The arithmetic expression shall be processed according to the rules given in Arithmetic Precision and Operations, with the following exceptions:

• Only signed long integer arithmetic is required.
• Only the decimal-constant, octal-constant, and hexadecimal-constant constants specified in the ISO C standard, Section 6.4.4.1 are required to be recognized as constants.
• The sizeof() operator and the prefix and postfix "++" and "--" operators are not required.
• Selection, iteration, and jump statements are not supported.

From my testing += works in dash, bash, and busybox sh, and oksh (openbsd ksh).

Either way I can change it later

[brauliohms]

Thanks, and it is really very controversial this limitation of what is POSIX or not.
And keep up the good work.