Add fmt to third-party-podspecs

packages/react-native/third-party-podspecs/fmt.podspec

@@ -0,0 +1,24 @@
+Pod::Spec.new do |spec|
+  spec.name = 'fmt'
+  spec.version = '6.2.1'
+  spec.license = { :type => 'MIT' }
+  spec.homepage = 'http://github.com/fmtlib/fmt'
+  spec.summary = '{fmt} is an open-source formatting library for C++. It can be used as a safe and fast alternative to (s)printf and iostreams.'
+  spec.authors = { "The fmt contributors": "https://github.com/fmtlib/fmt/issues" }
+  spec.source = { :git => 'https://github.com/fmtlib/fmt.git', :tag => '7.1.3' }
+
+  # Pinning to the same version as React.podspec.
+  spec.platforms = { :ios => '11.0', :osx => '10.14', :visionos => '1.0' }
+  spec.libraries = 'c++'
+  spec.public_header_files = 'include/fmt/*.{hpp,h}'
+  spec.header_mappings_dir = 'include'
+  spec.source_files = 'src/*.cc',
+                      'include/fmt/*.{hpp,h}'
+  spec.exclude_files = 'src/os.cc'
+  spec.pod_target_xcconfig = {
+    "HEADER_SEARCH_PATHS" => "${PODS_TARGET_SRCROOT}/include",
+    "CLANG_CXX_LANGUAGE_STANDARD" => "c++14",
+    "USE_HEADERMAP" => "NO",
+    "ALWAYS_SEARCH_USER_PATHS" => "NO"
+  }
+end

packages/rn-tester/Podfile

@@ -24,7 +24,8 @@ def pods(target_name, options = {}, use_flipper: false)
 
   # Hermes is now enabled by default.
   # The following line will only disable Hermes if the USE_HERMES envvar is SET to a value other than 1 (e.g. USE_HERMES=0).
-  hermes_enabled = !ENV.has_key?('USE_HERMES') || ENV['USE_HERMES'] == '1'
+  # Temporarily disable hermes as it depends on libevent
+  hermes_enabled = false # !ENV.has_key?('USE_HERMES') || ENV['USE_HERMES'] == '1'
   puts "Configuring #{target_name} with Fabric #{fabric_enabled ? "enabled" : "disabled"}.#{hermes_enabled ? " Using Hermes engine." : ""}"
 
   if ENV['RCT_NEW_ARCH_ENABLED'] == '1'