Issue #7492: Autoconf tests were leaving semaphore files behind. Add

sem_unlink calls to delete those semaphore files.

configure

 #! /bin/sh
-# From configure.in Revision: 76636 .
+# From configure.in Revision: 76644 .
 # Guess values for system-dependent variables and create Makefiles.
 # Generated by GNU Autoconf 2.61 for python 2.7.
 #
@@ -24474,6 +24474,7 @@ int main(void) {
     return 1;
   }
   sem_close(a);
+  sem_unlink("/autoconf");
   return 0;
 }
 
@@ -24548,7 +24549,7 @@ cat >>conftest.$ac_ext <<_ACEOF
 #include <sys/stat.h>
 
 int main(void){
-  sem_t *a = sem_open("/autoconf", O_CREAT, S_IRUSR|S_IWUSR, 0);
+  sem_t *a = sem_open("/autocftw", O_CREAT, S_IRUSR|S_IWUSR, 0);
   int count;
   int res;
   if(a==SEM_FAILED){
@@ -24558,6 +24559,7 @@ int main(void){
   }
   res = sem_getvalue(a, &count);
   sem_close(a);
+  sem_unlink("/autocftw");
   return res==-1 ? 1 : 0;
 }
 

configure.in

@@ -3455,6 +3455,7 @@ int main(void) {
     return 1;
   }
   sem_close(a);
+  sem_unlink("/autoconf");
   return 0;
 }
 ], ac_cv_posix_semaphores_enabled=yes,
@@ -3479,7 +3480,7 @@ AC_TRY_RUN([
 #include <sys/stat.h>
 
 int main(void){
-  sem_t *a = sem_open("/autoconf", O_CREAT, S_IRUSR|S_IWUSR, 0);
+  sem_t *a = sem_open("/autocftw", O_CREAT, S_IRUSR|S_IWUSR, 0);
   int count;
   int res;
   if(a==SEM_FAILED){
@@ -3489,6 +3490,7 @@ int main(void){
   }
   res = sem_getvalue(a, &count);
   sem_close(a);
+  sem_unlink("/autocftw");
   return res==-1 ? 1 : 0;
 }
 ], ac_cv_broken_sem_getvalue=no,