Changed .h ifdef/defines to use <NAME>_H format.

src/lib-managesieve/managesieve-arg.h

src/lib-managesieve/managesieve-parser.h

src/lib-managesieve/managesieve-quote.h

src/lib-sieve-tool/mail-raw.h

src/lib-sieve-tool/sieve-tool.h

src/lib-sieve/plugins/body/ext-body-common.h

src/lib-sieve/plugins/copy/sieve-ext-copy.h

src/lib-sieve/plugins/date/ext-date-common.h

src/lib-sieve/plugins/duplicate/ext-duplicate-common.h

src/lib-sieve/plugins/editheader/ext-editheader-common.h

src/lib-sieve/plugins/editheader/ext-editheader-limits.h

src/lib-sieve/plugins/enotify/ext-enotify-common.h

src/lib-sieve/plugins/enotify/ext-enotify-limits.h

src/lib-sieve/plugins/enotify/mailto/uri-mailto.h

src/lib-sieve/plugins/enotify/sieve-ext-enotify.h

src/lib-sieve/plugins/environment/ext-environment-common.h

src/lib-sieve/plugins/environment/sieve-ext-environment.h

src/lib-sieve/plugins/ihave/ext-ihave-binary.h

src/lib-sieve/plugins/ihave/ext-ihave-common.h

src/lib-sieve/plugins/imap4flags/ext-imap4flags-common.h