build warning: function declaration isn’t a prototype [-Wstrict-prototypes]

[336/435] Compiling C object tests/test-audioscrobbler.p/test-audioscrobbler.c.o
../tests/test-audioscrobbler.c:77:1: warning: function declaration isn’t a prototype [-Wstrict-prototypes]
   77 | rb_audioscrobbler_suite ()
      | ^~~~~~~~~~~~~~~~~~~~~~~
[337/435] Compiling C object tests/test-rb-lib.p/test-rb-lib.c.o
../tests/test-rb-lib.c:86:1: warning: function declaration isn’t a prototype [-Wstrict-prototypes]
   86 | rb_file_helpers_suite ()
      | ^~~~~~~~~~~~~~~~~~~~~
[340/435] Compiling C object tests/test-file-helpers.p/test-file-helpers.c.o
../tests/test-file-helpers.c:120:1: warning: function declaration isn’t a prototype [-Wstrict-prototypes]
  120 | rb_file_helpers_suite ()
      | ^~~~~~~~~~~~~~~~~~~~~