[vcpkg] Sort abi tags to ensure stability

toolsrc/include/vcpkg/build.h

@@ -209,6 +209,11 @@ namespace vcpkg::Build
     {
         std::string key;
         std::string value;
+
+        bool operator<(const AbiEntry& other) const
+        {
+            return key < other.key || (key == other.key && value < other.value);
+        }
     };
 
     struct AbiTagAndFile

toolsrc/src/vcpkg/build.cpp

@@ -449,6 +449,8 @@ namespace vcpkg::Build
         if (config.build_package_options.use_head_version == UseHeadVersion::YES)
             abi_tag_entries.emplace_back(AbiEntry{"head", ""});
 
+        Util::sort(abi_tag_entries);
+
         std::string full_abi_info =
             Strings::join("", abi_tag_entries, [](const AbiEntry& p) { return p.key + " " + p.value + "\n"; });