Fix pkgbuild to build from source

[FabioLolix]

Hello, I have seen your pkgbuild on the AUR and it have several issues, here it is revisioned for building from downloaded source

• from the AUR repo you can remove the readme and the license
• corrected maintainer typing
• following Arch Go packaging guidelines https://wiki.archlinux.org/title/Go_package_guidelines#Flags_and_build_options
• go and libcaca are not needed as depends, go only as makedepends
• downloaded sources are a binary, open source program need to build from source; otherwise re-upload pkgname-bin
• never use sudo in pkgbuilds
• about img2txt, please don't add not necessary stuff

PKGBUILD (kenbunshoku-haki) W: Non standard variable 'maintainer' doesn't start with an underscore
PKGBUILD (kenbunshoku-haki) W: Missing Maintainer tag
Checking kenbunshoku-haki-1.1-1-x86_64.pkg.tar.zst
kenbunshoku-haki W: ELF file ('usr/bin/kenbunshoku-haki') lacks FULL RELRO, check LDFLAGS.
kenbunshoku-haki W: ELF file ('usr/bin/kenbunshoku-haki') lacks PIE.
kenbunshoku-haki W: Dependency included, but may not be needed ('go')
kenbunshoku-haki W: Dependency included, but may not be needed ('libcaca')

Checking kenbunshoku-haki-1.1-1-x86_64.pkg.tar.zst
kenbunshoku-haki E: Dependency glibc detected and not included (libraries ['usr/lib/libc.so.6'] needed in files ['usr/bin/kenbunshoku-haki'])

[FabioLolix]

I'm not going to rebase