Updated to the latest libSession, added new build arg

LibSession-Util

@@ -1 +1 @@
-Subproject commit f4bca74a5fd46619ce96a931d1373104c8429db7
+Subproject commit b36c727f1e1f6be87718ce2203332ae48f2d89a5

Scripts/build_libSession_util.sh

@@ -200,6 +200,7 @@ for i in "${!TARGET_ARCHS[@]}"; do
         -DENABLE_BITCODE=$ENABLE_BITCODE \
         -DBUILD_TESTS=OFF \
         -DBUILD_STATIC_DEPS=ON \
+        -DENABLE_VISIBILITY=ON \
         -DSUBMODULE_CHECK=$submodule_check
 
     # Capture the exit status of the ./utils/static-bundle.sh command

Session.xcodeproj/project.pbxproj

@@ -7977,7 +7977,7 @@
 				CLANG_WARN__ARC_BRIDGE_CAST_NONARC = YES;
 				CLANG_WARN__DUPLICATE_METHOD_MATCH = YES;
 				CODE_SIGN_IDENTITY = "iPhone Developer";
-				CURRENT_PROJECT_VERSION = 443;
+				CURRENT_PROJECT_VERSION = 444;
 				ENABLE_BITCODE = NO;
 				ENABLE_STRICT_OBJC_MSGSEND = YES;
 				ENABLE_TESTABILITY = YES;
@@ -8055,7 +8055,7 @@
 				CLANG_WARN__ARC_BRIDGE_CAST_NONARC = YES;
 				CLANG_WARN__DUPLICATE_METHOD_MATCH = YES;
 				CODE_SIGN_IDENTITY = "iPhone Distribution";
-				CURRENT_PROJECT_VERSION = 443;
+				CURRENT_PROJECT_VERSION = 444;
 				ENABLE_BITCODE = NO;
 				ENABLE_STRICT_OBJC_MSGSEND = YES;
 				GCC_NO_COMMON_BLOCKS = YES;