forked from Imagelibrary/rtems
Fix a compiler warning about a missing prototype.
If you wonder why the function name is not `static`:
The code in the file only serves a test where the dynamic object loader
(aka dlopen()) should handle duplicated symbols in an archive.
testsuites/libtests/dl10/dl10-o6.c:14:5: warning: no previous prototype
for 'rtems_main_o5' [-Wmissing-prototypes]
14 | int rtems_main_o5 (void)
| ^~~~~~~~~~~~~