Fix the opt_barrier_ function prototypes

The portable function prototype was wrong.
1 file changed
tree: 8f986e5e74866854ce0d1e71aabbcab254070f6c
  1. auxiliary/
  2. math/
  3. test/
  4. .gitignore
  5. config.mk.dist
  6. LICENSE
  7. Makefile
  8. README