Fix gcc build

src/Mp3Decoder.cpp

@@ -37,6 +37,8 @@ using namespace nqr;
 #include "minimp3/minimp3.h"
 #include "minimp3/minimp3_ex.h"
 
+#include <cstring>
+
 void mp3_decode_internal(AudioData * d, const std::vector<uint8_t> & fileData)
 {
     mp3dec_t mp3d;

src/VorbisDecoder.cpp

@@ -26,6 +26,8 @@ OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 #include "Decoders.h"
 #include "libvorbis/include/vorbis/vorbisfile.h"
 
+#include <string.h>
+
 using namespace nqr;
 
 class VorbisDecoderInternal

src/WavPackDecoder.cpp

@@ -26,6 +26,7 @@ OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 #include "Decoders.h"
 #include "wavpack.h"
 #include <string.h>
+#include <cstring>
 
 using namespace nqr;