fix(build): Add missing cstdint includes (#3159)

In GCC 15, cstdint is less commonly included in stdlib headers so we
need explicit includes: https://gcc.gnu.org/gcc-15/porting_to.html

See-Also: https://bugs.gentoo.org/937526

Signed-off-by: John Helmert III <ajak@gentoo.org>

include/ipc/decoder.hpp

@@ -5,6 +5,8 @@
 #include "errors.hpp"
 #include "ipc/msg.hpp"
 
+#include <cstdint>
+
 POLYBAR_NS
 
 namespace ipc {

include/ipc/encoder.hpp

@@ -4,6 +4,8 @@
 #include "errors.hpp"
 #include "ipc/msg.hpp"
 
+#include <cstdint>
+
 POLYBAR_NS
 
 namespace ipc {

include/ipc/msg.hpp

@@ -3,6 +3,7 @@
 #include "common.hpp"
 
 #include <array>
+#include <cstdint>
 
 POLYBAR_NS
 

include/utils/color.hpp

@@ -1,6 +1,7 @@
 #pragma once
 
 #include <cstdlib>
+#include <cstdint>
 
 #include "common.hpp"
 

include/utils/string.hpp

@@ -1,5 +1,6 @@
 #pragma once
 
+#include <cstdint>
 #include <sstream>
 
 #include "common.hpp"

src/ipc/encoder.cpp

@@ -2,6 +2,7 @@
 
 #include <cassert>
 #include <cstring>
+#include <cstdint>
 
 POLYBAR_NS
 

src/utils/color.cpp

@@ -1,6 +1,7 @@
 #include "utils/color.hpp"
 
 #include <algorithm>
+#include <cstdint>
 
 POLYBAR_NS