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0036b12f - libtextstyle: Don't erase the .sym.in file if 'sed' is not GNU sed.

libtextstyle: Don't erase the .sym.in file if 'sed' is not GNU sed. * libtextstyle/lib/Makefile.am (libtextstyle.sym.in): Test the exit status of the declared.sh command. Preserve the existing libtextstyle.sym if it failed.