fix: remove duplicated vars

sdks/hermes-engine/hermes-engine.podspec

@@ -21,9 +21,6 @@ version = package['version']
 hermestag_file = File.join(react_native_path, "sdks", ".hermesversion")
 isInCI = ENV['CI'] == true
 
-
-ENV['REACT_NATIVE_PATH'] = react_native_path
-
 # sdks/hermesc/osx-bin/ImportHermesc.cmake
 import_hermesc_file=File.join(react_native_path, "sdks", "hermesc", "osx-bin", "ImportHermesc.cmake")
 
@@ -71,26 +68,27 @@ Pod::Spec.new do |spec|
   }
 
   if source[:git] then
+    hermes_utils_path = "#{react_native_path}/sdks/hermes-engine/utils"
     spec.prepare_command = <<-EOS
 
       # When true, debug build will be used.
       # See `build-apple-framework.sh` for details
-      
+
       export RELEASE_VERSION="#{version}"
       export IOS_DEPLOYMENT_TARGET="#{spec.deployment_target('ios')}"
       export MAC_DEPLOYMENT_TARGET="#{spec.deployment_target('osx')}"
 
-      BUILD_TYPE=#{HermesHelper::BUILD_TYPE == :debug ? "Debug" : "Release"}
+      export BUILD_TYPE=#{HermesHelper::BUILD_TYPE == :debug ? "Debug" : "Release"}
 
       # Set HERMES_OVERRIDE_HERMESC_PATH if pre-built HermesC is available
       #{File.exist?(import_hermesc_file) ? "export HERMES_OVERRIDE_HERMESC_PATH=#{import_hermesc_file}" : ""}
       #{File.exist?(import_hermesc_file) ? "echo \"Overriding HermesC path...\"" : ""}
 
       # Build iOS framework
-      $REACT_NATIVE_PATH/sdks/hermes-engine/utils/build-ios-framework.sh
+      #{hermes_utils_path}/build-ios-framework.sh
 
       # Build Mac framework
-      $REACT_NATIVE_PATH/sdks/hermes-engine/utils/build-mac-framework.sh
+      #{hermes_utils_path}/build-mac-framework.sh
     EOS
   end
 end