Add missing includes for macOS.

Signed-off-by: Stefan Westerfeld <stefan@space.twc.de>

src/rawconverter.cc

@@ -17,6 +17,8 @@
 
 #include "rawconverter.hh"
 
+#include <array>
+
 #include <math.h>
 
 using std::vector;

src/rawinputstream.cc

@@ -20,6 +20,7 @@
 
 #include <assert.h>
 #include <string.h>
+#include <errno.h>
 
 using std::string;
 using std::vector;

src/rawoutputstream.cc

@@ -19,6 +19,7 @@
 
 #include <assert.h>
 #include <string.h>
+#include <errno.h>
 
 using std::string;
 using std::vector;