open_posix: fix the testcase of sem_open/s-c1.c build warning

[extinguish]

the sem_open/s-c1.c has build warning, fix the build warning by remove the "static" declaration of "struct row"

Signed-off-by: guoshichao [email protected]

[metan-ucw]

This is obviously correct, but I do get a few more errors when trying to compile the test.

../../../stress/threads/sem_open/s-c1.c: In function ‘main’:
../../../stress/threads/sem_open/s-c1.c:114:14: warning: unused parameter ‘argc’ [-Wunused-parameter]
  114 | int main(int argc, char *argv[])
      |          ~~~~^~~~
../../../stress/threads/sem_open/s-c1.c:114:26: warning: unused parameter ‘argv’ [-Wunused-parameter]
  114 | int main(int argc, char *argv[])
      |                    ~~~~~~^~~~~~

The main should be defined as int main(void) and it fails to compile too because of missing -lm for me, I guess that it's missing LDLIBS file with -lm somewhere.

Can you please fix these two problems too?