use system iconv to see if smoketest catches it

Author: ychin

.github/workflows/macvim-buildtest.yaml

@@ -106,7 +106,7 @@ jobs:
         with:
           formula: gettext
           contents: lib/libintl.a,lib/libintl.dylib
-          gnuiconv: true  # gettext needs to match MacVim in using the same version of iconv
+          #gnuiconv: true  # gettext needs to match MacVim in using the same version of iconv
 
       # Set up, install, and cache libsodium library for encryption.
 
@@ -233,7 +233,7 @@ jobs:
           fi
 
           # Use Homebrew GNU libiconv since Apple iconv has been broken since macOS 14
-          sed -i.bak -f ci/config.mk.brew-libiconv.sed src/auto/config.mk
+          #sed -i.bak -f ci/config.mk.brew-libiconv.sed src/auto/config.mk
 
       - name: Modify configure result
         if: inputs.publish