externals: Update fmt to 4d35f94

Versions prior to this didn't compile on OpenBSD due to unconditional
use of the non-standard strtod_l() function.

The fmt::MemoryWriter API has been removed in the intervening
versions, so replace its use with fmt::memory_buffer and fmt::format_to.

The library also no longer provides the fmt::fmt ALIAS, so define
it in externals/CMakeLists.txt.

externals/CMakeLists.txt

@@ -17,6 +17,7 @@ endif()
 
 # libfmt
 add_subdirectory(fmt)
+add_library(fmt::fmt ALIAS fmt)
 
 # getopt
 if (MSVC)

externals/fmt

@@ -1 +1 @@
-Subproject commit ac5484c4e7365b59d8c7e14db6778de26635e428
+Subproject commit 4d35f94133ed14794e53c9f8627d047b408e0dc7

src/core/hle/service/service.cpp

@@ -112,15 +112,15 @@ void ServiceFrameworkBase::ReportUnimplementedFunction(Kernel::HLERequestContext
     auto cmd_buf = ctx.CommandBuffer();
     std::string function_name = info == nullptr ? fmt::format("{}", ctx.GetCommand()) : info->name;
 
-    fmt::MemoryWriter w;
-    w.write("function '{}': port='{}' cmd_buf={{[0]={:#x}", function_name, service_name,
+    fmt::memory_buffer buf;
+    fmt::format_to(buf, "function '{}': port='{}' cmd_buf={{[0]={:#x}", function_name, service_name,
                    cmd_buf[0]);
     for (int i = 1; i <= 8; ++i) {
-        w.write(", [{}]={:#x}", i, cmd_buf[i]);
+        fmt::format_to(buf, ", [{}]={:#x}", i, cmd_buf[i]);
     }
-    w << '}';
+    buf.push_back('}');
 
-    LOG_ERROR(Service, "unknown / unimplemented %s", w.c_str());
+    LOG_ERROR(Service, "unknown / unimplemented %s", fmt::to_string(buf).c_str());
     UNIMPLEMENTED();
 }