configure.ac: align --enable-debug help

Without that fix, the --enable-debug is missaligned with the other
help that is around it:
    Optional Features:
      --disable-option-checking  ignore unrecognized --enable/--with options
      --disable-FEATURE       do not include FEATURE (same as --enable-FEATURE=no)
      --enable-FEATURE[=ARG]  include FEATURE [ARG=yes]
      --enable-silent-rules   less verbose build output (undo: "make V=1")
      --disable-silent-rules  verbose build output (undo: "make V=0")
      --enable-dependency-tracking
                              do not reject slow dependency extractors
      --disable-dependency-tracking
                              speeds up one-time build
      --enable-static[=PKGS]  build static libraries [default=no]
      --enable-shared[=PKGS]  build shared libraries [default=yes]
      --enable-fast-install[=PKGS]
                              optimize for fast installation [default=yes]
      --disable-libtool-lock  avoid locking (might break parallel builds)
      --enable-debug            Enable debug build (default=disabled)

    Optional Packages:
      --with-PACKAGE[=ARG]    use PACKAGE [ARG=yes]
      --without-PACKAGE       do not use PACKAGE (same as --with-PACKAGE=no)
      --with-pic[=PKGS]       try to use only PIC/non-PIC objects [default=use
                              both]
      --with-aix-soname=aix|svr4|both
                              shared library versioning (aka "SONAME") variant to
                              provide on AIX, [default=aix].
      --with-gnu-ld           assume the C compiler uses GNU ld [default=no]
      --with-sysroot[=DIR]    Search for dependent libraries within DIR (or the
                              compiler's sysroot if not specified).

Signed-off-by: Denis 'GNUtoo' Carikli <GNUtoo@cyberdimension.org>

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