rework method of disabling warnings from GCC * configure.ac: Check for GCC's #pragma GCC diagnostic feature. * libinterp/module.mk, libinterp/corefcn/module.mk, libinterp/parse-tree/module.mk: Eliminate separate libraries for TeX and Octave parsers. * oct-tex-lexer.in.ll, oct-tex-parser.in.yy, lex.ll, oct-parse.in.yy: Use GCC #pragma GCC diagnostic feature to more selectively disable warnings in generated code. * libgui/module.mk (rcc-command): Use GCC #pragma GCC diagnostic feature to more selectively disable warnings in generated code.

7f19e7f2afa2b1476983003f9cd6df2f5b2a4b08 gnulib-hg