stag: fix `gcc-15` build (drom `-Werror`)

Without the change `stag` build fails on `master` as:

    $ nix build --no-link -f. -L stag
    stag> view.c:55:26: error: initializer-string for array of 'char' truncates NUL terminator but destination lacks 'nonstring' attribute (10 chars into 9 available) [-Werror=unterminated-string-initialization]
    stag>    55 |   char unitprefixes[9] = " KMGTPEZY";
    stag>       |                          ^~~~~~~~~~~
    stag> cc1: all warnings being treated as errors
    stag> make: *** [Makefile:12: stag] Error 1

Blanket `-Werror` is usually prone to failure on new
compiler versions. Let's drom `-Werror`.

0 files changed, 0 insertions, 0 deletions