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cee8a25d - build: Don't fetch gnulib a second time in libtextstyle.

build: Don't fetch gnulib a second time in libtextstyle. * autogen.sh: Set GNULIB_SRCDIR when invoking libtextstyle/autogen.sh. * libtextstyle/autogen.sh: Remove all git operations. Look at the GNULIB_SRCDIR environment variable. Ignore the GNULIB_TOOL environment variable.