Link with stdthreads for FreeBSD

.github/workflows/ccpp.yml

@@ -121,7 +121,6 @@ jobs:
 
   build_freebsd:
     runs-on: macos-12
-    name: FreeBSD over MACOS (virtualbox)
     steps:
     - uses: actions/checkout@v3
     - name: Test in FreeBSD
@@ -132,4 +131,4 @@ jobs:
         run: |
              freebsd-version
              make clean && make check -j 2 CC="cc -std=c99 -Wno-unknown-warning-option -Werror"
-             make clean && make check -j 2 CC="cc -std=c11 -Wno-unknown-warning-option -Werror"
+             make clean && make check -j 2 CC="cc -std=c11 -Wno-unknown-warning-option -Werror" LDFLAGS="-lstdthreads"