My first run of `make release` failed with this error.

    cc -std=c11 -Wall -Wextra -Werror -pedantic -O3 -DNDEBUG -c -o build/main.o src/main.c
    src/main.c: In function ‘main’:
    src/main.c:23:3: error: ignoring return value of ‘fread’ declared with attribute ‘warn_unused_result’ [-Werror=unused-result]
      23 |   fread(file, file_size, 1, fp);
          |   ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    cc1: all warnings being treated as errors