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.

2 files changed, 1 insertions, 0 deletions

diff --git a/externals/CMakeLists.txt b/externals/CMakeLists.txt
index ec3c70779..d2b0652a5 100644
--- a/externals/CMakeLists.txt
+++ b/externals/CMakeLists.txt
@@ -17,6 +17,7 @@ endif()
 
 # libfmt
 add_subdirectory(fmt)
+add_library(fmt::fmt ALIAS fmt)
 
 # getopt
 if (MSVC)
diff --git a/externals/fmt b/externals/fmt
-Subproject ac5484c4e7365b59d8c7e14db6778de26635e42
+Subproject 4d35f94133ed14794e53c9f8627d047b408e0dc