Fix GCC 13 build errors

Signed-off-by: David Abdurachmanov <davidlt@rivosinc.com>

endless-sky.spec

@@ -1,6 +1,6 @@
 Name:		endless-sky
 Version:	0.9.16.1
-Release:	2%{?dist}
+Release:	2.0.riscv64%{?dist}
 Summary:	Space exploration, trading, and combat game
 
 License:	GPLv3
@@ -15,6 +15,9 @@ Patch0:		endless-sky-0.9.13-remove-games-path.patch
 # Unset CCFLAGS override inside SConstruct.
 Patch1:		endless-sky-0.9.14-remove-additional-ccflags.patch
 
+# Fix GCC 13 build errors
+Patch2:		sky-fix-gcc13.patch
+
 Requires:	%{name}-data = %{version}-%{release}
 BuildRequires:	scons
 BuildRequires:	gcc-c++
@@ -104,6 +107,9 @@ sed -i 's|/app|%{_prefix}|g' %{buildroot}%{_bindir}/%{name}
 
 
 %changelog
+* Wed May 10 2023 David Abdurachmanov <davidlt@rivosinc.com> - 0.9.16.1-2.0.riscv64
+- Fix GCC 13 build errors
+
 * Thu Jan 19 2023 Fedora Release Engineering <releng@fedoraproject.org> - 0.9.16.1-2
 - Rebuilt for https://fedoraproject.org/wiki/Fedora_38_Mass_Rebuild
 

sky-fix-gcc13.patch

@@ -0,0 +1,36 @@
+diff --git source/ImageBuffer.h source/ImageBuffer.h
+index afe4ea4..784ee25 100644
+--- source/ImageBuffer.h
++++ source/ImageBuffer.h
+@@ -16,6 +16,7 @@ this program. If not, see <https://www.gnu.org/licenses/>.
+ #ifndef IMAGE_BUFFER_H_
+ #define IMAGE_BUFFER_H_
+ 
++#include <cstdint>
+ #include <string>
+ 
+ 
+diff --git source/Preferences.h source/Preferences.h
+index 04a5ad8..9eb5e05 100644
+--- source/Preferences.h
++++ source/Preferences.h
+@@ -16,6 +16,7 @@ this program. If not, see <https://www.gnu.org/licenses/>.
+ #ifndef PREFERENCES_H_
+ #define PREFERENCES_H_
+ 
++#include <cstdint>
+ #include <string>
+ 
+ 
+diff --git source/Sound.cpp source/Sound.cpp
+index 6927c72..9f73c17 100644
+--- source/Sound.cpp
++++ source/Sound.cpp
+@@ -24,6 +24,7 @@ this program. If not, see <https://www.gnu.org/licenses/>.
+ #include <OpenAL/al.h>
+ #endif
+ 
++#include <cstdint>
+ #include <cstdio>
+ #include <vector>
+