Improve style/consistency among ports maintained by jbeich

[jbeich]

Summary

Improve style/consistency among ports I maintain

• Convert to COPYTREE_SHARE
• Drop unnecessary MKDIR before COPYTREE_SHARE
• Drop bsd.port.options.mk if only DOCS requires it without dependencies
• Use separate backup if several REINPLACE_CMD against same file
• audio/alsa-utils: convert to LIBS

Test Plan

poudriere bulk -t for 10.1R i386 logs:
alsa-utils-1.0.28.log
fusefs-simple-mtpfs-0.2.s20150108.log
katawa-shoujo-1.2.log
onscripter-20150208.log
openra-20141029_1.log
ponscripter-sekai-0.0.6.log
renpy-6.18.3.log
rlvm-0.14.log
transmission-cli-2.84_2.log
xsystem35-1.7.3.p5_2.log

[jbeich]

Hmm, all those cases of

	${MKDIR} ${STAGEDIR}${DOCSDIR}
	${INSTALL_MAN} ${PORTDOCS:S,^,${WRKSRC}/,} ${STAGEDIR}${DOCSDIR}

can be replaced with

	(cd ${WRKSRC} && ${COPYTREE_SHARE} \
		"${PORTDOCS}" ${STAGEDIR}${DOCSDIR})

[jbeich]

• Convert INSTALL_MAN uses to COPYTREE_SHARE

[jbeich]

Closed by commit rP379072 (authored by @jbeich).