Move test:Unicode.Char into dev build

bin/targets.sh

@@ -109,7 +109,8 @@ targets () {
   INDIVIDUAL_TARGETS="\
       Data.Unfold \
       Unicode.Stream \
-      Unicode.Char \
+      $(test_only $(dev_build Unicode.Char)) \
+      `bench_only Unicode.Char` \
       `bench_only Unicode.Utf8` \
       FileSystem.Handle \
       `test_only FileSystem.Event` \

test/streamly-tests.cabal

@@ -371,6 +371,10 @@ test-suite Unicode.Char
   type: exitcode-stdio-1.0
   main-is: Streamly/Test/Unicode/Char.hs
   ghc-options: -main-is Streamly.Test.Unicode.Char.main
+  if flag(dev)
+    buildable: True
+  else
+    buildable: False
 
 test-suite version-bounds
   import: test-options