CDRIVER-2694 remove solaris pthread_once_t code

Solaris 10 and older requires a special syntax for initializing a
pthread_once_t, but we dropped Solaris entirely in 1.8.0.

Author: ajdavis

src/libbson/CMakeLists.txt

@@ -36,9 +36,6 @@ set (CPACK_PACKAGE_VERSION_MINOR ${BSON_MINOR_VERSION})
 include (CPack)
 TEST_BIG_ENDIAN (BSON_BIG_ENDIAN)
 
-# These need proper checks like automake.
-set (BSON_PTHREAD_ONCE_INIT_NEEDS_BRACES 0)
-
 #librt needed on linux for clock_gettime
 find_library (RT_LIBRARY rt)
 if (RT_LIBRARY)

src/libbson/src/bson/bson-config.h.in

@@ -42,16 +42,6 @@
 #endif
 
 
-/*
- * Define to 1 if your system requires {} around PTHREAD_ONCE_INIT.
- * This is typically just Solaris 8-10.
- */
-#define BSON_PTHREAD_ONCE_INIT_NEEDS_BRACES @BSON_PTHREAD_ONCE_INIT_NEEDS_BRACES@
-#if BSON_PTHREAD_ONCE_INIT_NEEDS_BRACES != 1
-# undef BSON_PTHREAD_ONCE_INIT_NEEDS_BRACES
-#endif
-
-
 /*
  * Define to 1 if you have clock_gettime() available.
  */

src/libbson/src/bson/bson-thread-private.h

@@ -46,14 +46,7 @@ BSON_BEGIN_DECLS
 #define bson_once pthread_once
 #define BSON_ONCE_FUN(n) void n (void)
 #define BSON_ONCE_RETURN return
-#ifdef BSON_PTHREAD_ONCE_INIT_NEEDS_BRACES
-#define BSON_ONCE_INIT  \
-   {                    \
-      PTHREAD_ONCE_INIT \
-   }
-#else
 #define BSON_ONCE_INIT PTHREAD_ONCE_INIT
-#endif
 #else
 #define bson_mutex_t CRITICAL_SECTION
 #define bson_mutex_init InitializeCriticalSection