Fix g++ on MacOS compilation error

Author: stephen-webb

.github/workflows/log4cxx-macos.yml

@@ -36,6 +36,11 @@ jobs:
             cxx: clang++
             odbc: ON
             qt: OFF
+          - name: osx-g++
+            os: macos-latest
+            cxx: g++
+            odbc: OFF
+            qt: OFF
 
     steps:
     - uses: actions/checkout@v4

src/main/cpp/logstream.cpp

@@ -41,7 +41,7 @@ logstream_base::logstream_ios_base::logstream_ios_base(std::ios_base::fmtflags i
 	memset(this, 0, sizeof(*this));
 #endif
 #if LOG4CXX_INIT_IOS_BASE
-	init(NULL);
+	std::ios_base::Init{};
 #endif
 	flags(initval);
 	precision(initsize);