Convert a ton of things over to fextl

FEXHeaderUtils/FEXHeaderUtils/SymlinkChecks.h

@@ -1,13 +1,14 @@
 #pragma once
+#include <FEXCore/fextl/string.h>
+
 #include <fcntl.h>
-#include <string>
 #include <sys/stat.h>
 #include <span>
 #include <unistd.h>
 
 namespace FHU::Symlinks {
 // Checks to see if a filepath is a symlink.
-inline bool IsSymlink(const std::string &Filename) {
+inline bool IsSymlink(const fextl::string &Filename) {
   struct stat Buffer{};
   int Result = lstat(Filename.c_str(), &Buffer);
   return Result == 0 && S_ISLNK(Buffer.st_mode);
@@ -17,7 +18,7 @@ inline bool IsSymlink(const std::string &Filename) {
 // Doesn't handle recursive symlinks.
 // Doesn't append null terminator character.
 // Returns a string_view of the resolved path, or an empty view on error.
-inline std::string_view ResolveSymlink(const std::string &Filename, std::span<char> ResultBuffer) {
+inline std::string_view ResolveSymlink(const fextl::string &Filename, std::span<char> ResultBuffer) {
   ssize_t Result = readlink(Filename.c_str(), ResultBuffer.data(), ResultBuffer.size());
   if (Result == -1) {
     return {};