Add missing includes (#7501)

BUG=320668410

filament/backend/src/DataReshaper.h

@@ -19,6 +19,7 @@
 
 #include <backend/PixelBufferDescriptor.h>
 
+#include <cstring>
 #include <stddef.h>
 #include <stdint.h>
 

filament/src/details/Material.h

@@ -33,6 +33,7 @@
 #include <utils/Mutex.h>
 
 #include <atomic>
+#include <optional>
 
 namespace filament {
 

libs/utils/src/linux/Path.cpp

@@ -22,6 +22,8 @@
 #include <unistd.h>
 #include <sys/stat.h>
 
+#include <cstdint>
+
 namespace utils {
 
 bool Path::mkdir() const {

tools/resgen/src/main.cpp

@@ -19,6 +19,7 @@
 #include <getopt/getopt.h>
 
 #include <algorithm>
+#include <cstdint>
 #include <fstream>
 #include <iomanip>
 #include <iostream>