bzero() is a POSIX-specific fuinction.
x86_64-w64-mingw32-gcc does not provide one.

https://github.com/mpruett/audiofile/commit/d9363a5d16af4ce55eb35c5aad9ca19bb9c53cbe

commit d9363a5d16af4ce55eb35c5aad9ca19bb9c53cbe
Author: Daniel Verkamp <daniel@drv.nu>
Date:   Mon Jul 4 21:57:44 2016 -0500

    Replace bzero() with memset().

diff --git a/libaudiofile/CAF.cpp b/libaudiofile/CAF.cpp
index d2b62ea..5752117 100644
--- a/libaudiofile/CAF.cpp
+++ b/libaudiofile/CAF.cpp
@@ -720,3 +720,3 @@ void CAFFile::initALACCompressionParams()
 	m_codecData = new Buffer(codecDataSize);
-	bzero(m_codecData->data(), m_codecData->size());
+	memset(m_codecData->data(), 0, m_codecData->size());