build: Move local gnulib modules that are only needed in libtextstyle.
* libtextstyle/gnulib-local/*: Many files moved to here from gnulib-local/*.
* libtextstyle/gnulib-local/modules/libglib: Apply diff.
* libtextstyle/gnulib-local/modules/libglib.diff: Remove file.
* libtextstyle/gnulib-local/modules/libcroco: Apply diff.
* libtextstyle/gnulib-local/modules/libcroco.diff: Remove file.
* libtextstyle/gnulib-local/modules/term-styled-ostream: Apply diff.
* libtextstyle/gnulib-local/modules/term-styled-ostream.diff: Remove file.
* libtextstyle/gnulib-local/modules/html-styled-ostream: Apply diff.
* libtextstyle/gnulib-local/modules/html-styled-ostream.diff: Remove file.
* libtextstyle/gnulib-local/modules/noop-styled-ostream: Apply diff.
* libtextstyle/gnulib-local/modules/noop-styled-ostream.diff: Remove file.
* libtextstyle/woe32dll/c++term-styled-ostream.cc: Remove file.
* libtextstyle/woe32dll/c++html-styled-ostream.cc: Remove file.
* libtextstyle/woe32dll/c++noop-styled-ostream.cc: Remove file.
* gettext-tools/woe32dll/c++term-styled-ostream.cc: Remove file.
* gettext-tools/woe32dll/c++html-styled-ostream.cc: Remove file.
* gnulib-local/Makefile.am (EXTRA_DIST): Remove the files that were moved away.
* libtextstyle/Makefile.am (EXTRA_DIST): Add the files that were moved to
libtextstyle/gnulib-local/. Add build-aux/moopp.
* Makefile.am (EXTRA_DIST): Remove build-aux/moopp.