PHPC-2477: MONGOC_HAVE_WEAK_SYMBOLS is obsolete

CDRIVER-2600 removed MONGOC_HAVE_WEAK_SYMBOLS

Author: jmikola

config.m4

@@ -351,7 +351,6 @@ if test "$PHP_MONGODB" != "no"; then
     m4_include(PHP_MONGODB_BASEDIR/scripts/autotools/libmongoc/Endian.m4)
     m4_include(PHP_MONGODB_BASEDIR/scripts/autotools/libmongoc/FindDependencies.m4)
     m4_include(PHP_MONGODB_BASEDIR/scripts/autotools/libmongoc/Versions.m4)
-    m4_include(PHP_MONGODB_BASEDIR/scripts/autotools/libmongoc/WeakSymbols.m4)
 
     dnl This include modifies the value of $PHP_MONGODB_CLIENT_SIDE_ENCRYPTION to "yes"
     dnl or "no" depending on whether dependencies for libmongocrypt are fulfilled

config.w32

@@ -183,7 +183,6 @@ if (PHP_MONGODB != "no") {
     MONGOC_HAVE_SASL_CLIENT_DONE: 0,
     MONGOC_HAVE_SCHED_GETCPU: 0,
     MONGOC_HAVE_SOCKLEN: 1,
-    MONGOC_HAVE_WEAK_SYMBOLS: 0,
     MONGOC_NO_AUTOMATIC_GLOBALS: 1,
     MONGOC_SOCKET_ARG2: "struct sockaddr",
     MONGOC_SOCKET_ARG3: "socklen_t",