tests: we might need to find gnulib headers

    315. calc.at:596: testing Calculator  ...
    ++ cat
    ++ test x = x1
    ++ set +x
    bison/tests/calc.at:596: bison -fno-caret -o calc.c calc.y
    ++ bison -fno-caret -o calc.c calc.y
    ++ set +x
    bison/tests/calc.at:596: $BISON_C_WORKS
    stderr:
    stdout:
    ++ set +x
    bison/tests/calc.at:596: $CC $CFLAGS $CPPFLAGS $LDFLAGS -o calc calc.c $LIBS
    ++ ccache clang-mp-6.0 -Qunused-arguments -O3 -g -Wall -Wextra -Wno-sign-compare -Wcast-align -Wdocumentation -Wformat -Wpointer-arith -Wwrite-strings -Wbad-function-cast -Wshadow -Wstrict-prototypes -Wmissing-declarations -Wmissing-prototypes -Wmissing-declarations -Wmissing-prototypes -Wundef -pedantic -Wsign-compare -fno-color-diagnostics -Wno-keyword-macro -Werror -Ibison/_build/6s/lib -DNDEBUG -isystem /opt/local/include -I/opt/local/include -L/opt/local/lib -o calc calc.c bison/_build/6s/lib/libbison.a -lintl -Wl,-framework -Wl,CoreFoundation
    stderr:
    In file included from calc.y:198:
    bison/_build/6s/lib/unistd.h:592:11: fatal error: 'getopt-pfx-core.h' file not found
    # include <getopt-pfx-core.h>
              ^~~~~~~~~~~~~~~~~~~
    1 error generated.
    stdout:
    bison/tests/calc.at:596: exit code was 1, expected 0
    315. calc.at:596: 315. Calculator  (calc.at:596): FAILED (calc.at:596)

* tests/atlocal.in (CPPFLAGS): Find gnulib's headers.

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