Fix FTBFS due to undefined uchar

Signed-off-by: Michele Calgaro <michele.calgaro@yahoo.it>
(cherry picked from commit 906eb9cec6)

src/metadata/m4a/mp4file.cpp

@@ -131,12 +131,12 @@ uint MP4::File::readSystemsLen()
   uint length = 0;
   uint nbytes = 0;
   ByteVector   input;
-  uchar tmp_input;
+  unsigned char tmp_input;
 
   do
   {
     input = readBlock(1);
-    tmp_input = static_cast<uchar>(input[0]);
+    tmp_input = static_cast<unsigned char>(input[0]);
     nbytes++;
     length = (length<<7) | (tmp_input&0x7F);
   } while( (tmp_input&0x80) && (nbytes<4) );

src/metadata/m4a/mp4isofullbox.cpp

@@ -27,7 +27,7 @@ using namespace TagLib;
 class MP4::Mp4IsoFullBox::Mp4IsoFullBoxPrivate
 {
 public:
-	uchar version;
+	unsigned char version;
 	uint  flags;
 }; // Mp4IsoFullBoxPrivate
 
@@ -55,7 +55,7 @@ void  MP4::Mp4IsoFullBox::parsebox()
   parse();
 }
 
-uchar MP4::Mp4IsoFullBox::version()
+unsigned char MP4::Mp4IsoFullBox::version()
 {
   return d->version;
 }

src/metadata/m4a/mp4isofullbox.h

@@ -38,7 +38,7 @@ namespace TagLib
       virtual ~Mp4IsoFullBox();
 
       //! function to get the version of box
-      uchar version();
+      unsigned char version();
       //! function to get the flag map
       uint  flags();