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No "#pragma GCC" pragma allows macro-expansion of its arguments, so no namespace issues arise from use of such pragmas in installed headers. Ignore them in conformtest tests of header namespace. Tested for x86_64, in conjunction with Paul's patch <https://sourceware.org/pipermail/libc-alpha/2021-August/130571.html> adding use of such pragmas to installed headers shared with gnulib. (cherry picked from commit 6090a4a1b32fd7859d0ad5b7e9b240bd5fa04b3f)