fix: Add missing <cstdint> includes (#1305)

GCC version 13 needs <cstdint> to be explicitly included to
provide fixed bits integer types. Some files using it inludes
<stdint.h>, this commit adds <cstdint> inclusion to the
missing ones and it's needed to compile project on GCC 13.

Source: https://gcc.gnu.org/gcc-13/porting_to.html

packager/hls/base/tag.h

@@ -7,6 +7,7 @@
 #ifndef PACKAGER_HLS_BASE_TAG_H_
 #define PACKAGER_HLS_BASE_TAG_H_
 
+#include <cstdint>
 #include <string>
 
 namespace shaka {

packager/hls/public/hls_params.h

@@ -7,6 +7,7 @@
 #ifndef PACKAGER_HLS_PUBLIC_HLS_PARAMS_H_
 #define PACKAGER_HLS_PUBLIC_HLS_PARAMS_H_
 
+#include <cstdint>
 #include <string>
 
 namespace shaka {

packager/media/base/buffer_writer.h

@@ -7,6 +7,7 @@
 #ifndef PACKAGER_MEDIA_BASE_BUFFER_WRITER_H_
 #define PACKAGER_MEDIA_BASE_BUFFER_WRITER_H_
 
+#include <cstdint>
 #include <vector>
 
 #include "packager/base/macros.h"

packager/media/base/fourccs.h

@@ -5,6 +5,7 @@
 #ifndef PACKAGER_MEDIA_BASE_FOURCCS_H_
 #define PACKAGER_MEDIA_BASE_FOURCCS_H_
 
+#include <cstdint>
 #include <string>
 
 namespace shaka {

packager/media/base/id3_tag.h

@@ -7,6 +7,7 @@
 #ifndef PACKAGER_MEDIA_BASE_ID3_TAG_H_
 #define PACKAGER_MEDIA_BASE_ID3_TAG_H_
 
+#include <cstdint>
 #include <string>
 #include <vector>
 

packager/media/base/id3_tag_unittest.cc

@@ -4,6 +4,8 @@
 // license that can be found in the LICENSE file or at
 // https://developers.google.com/open-source/licenses/bsd
 
+#include <cstdint>
+
 #include "packager/media/base/id3_tag.h"
 
 #include <gmock/gmock.h>

packager/packager.h

@@ -7,6 +7,7 @@
 #ifndef PACKAGER_PACKAGER_H_
 #define PACKAGER_PACKAGER_H_
 
+#include <cstdint>
 #include <memory>
 #include <string>
 #include <vector>