textproc/py-ebcdic: Add NO_ARCH

- With I'm here:
  - Fix USE_GITHUB usage: Use DISTVERSIONPREFIX instead of GH_TAGNAME
  - Fix indent

Approved by:	portmgr (blanket)

textproc/py-ebcdic/Makefile

@@ -1,22 +1,24 @@
 PORTNAME=	ebcdic
 PORTVERSION=	1.1.1
+DISTVERSIONPREFIX=	v
 CATEGORIES=	textproc python
 PKGNAMEPREFIX=	${PYTHON_PKGNAMEPREFIX}
 
 MAINTAINER=	DtxdF@disroot.org
 COMMENT=	Additional EBCDIC codecs
-WWW=	https://github.com/roskakori/CodecMapper
+WWW=		https://github.com/roskakori/CodecMapper
 
 LICENSE=	BSD2CLAUSE
 LICENSE_FILE=	${WRKSRC}/LICENSE.txt
 
-USES=	python:3.8+
+USES=		python:3.8+
 USE_GITHUB=	yes
 GH_ACCOUNT=	roskakori
 GH_PROJECT=	CodecMapper
-GH_TAGNAME=	v1.1.1
 USE_PYTHON=	autoplist distutils unittest
 
+NO_ARCH=	yes
+
 WRKSRC_SUBDIR=	${PORTNAME}
 
 .include <bsd.port.mk>