disable flight_sql support on windows after all

it doesn't build on windows, fails without much info:
```
[75/110] Building CXX object src\arrow\flight\sql\CMakeFiles\arrow_flight_sql_shared.dir\Unity\unity_0_cxx.cxx.obj
FAILED: src/arrow/flight/sql/CMakeFiles/arrow_flight_sql_shared.dir/Unity/unity_0_cxx.cxx.obj
```

recipe/bld-arrow.bat

@@ -24,7 +24,6 @@ cmake -G "Ninja" ^
       -DARROW_DATASET:BOOL=ON ^
       -DARROW_FLIGHT:BOOL=ON ^
       -DARROW_FLIGHT_REQUIRE_TLSCREDENTIALSOPTIONS:BOOL=ON ^
-      -DARROW_FLIGHT_SQL:BOOL=ON ^
       -DARROW_GANDIVA:BOOL=ON ^
       -DARROW_GCS:BOOL=ON ^
       -DARROW_HDFS:BOOL=ON ^

recipe/meta.yaml

@@ -134,21 +134,19 @@ outputs:
     test:
       commands:
         {% set headers = [
-            "arrow/api.h", "arrow/flight/types.h", "arrow/flight/sql/api.h",
-            "gandiva/engine.h", "parquet/api/reader.h"
+            "arrow/api.h", "arrow/flight/types.h", "gandiva/engine.h", "parquet/api/reader.h"
         ] %}
-        {% set headers = headers + ["plasma/client.h"] %}  # [unix]
+        {% set headers = headers + ["arrow/flight/sql/api.h", "plasma/client.h"] %}  # [unix]
         {% for each_header in headers %}
         # headers
         - test -f $PREFIX/include/{{ each_header }} || (echo "{{ each_header }} not found" && exit 1)  # [unix]
         - if not exist %LIBRARY_INC%\{{ "\\".join(each_header.split("/")) }} exit 1                    # [win]
         {% endfor %}
 
         {% set libs = (cuda_compiler_version != "None") * ["arrow_cuda"] + [
-            "arrow", "arrow_dataset", "arrow_flight", "arrow_flight_sql",
-            "arrow_python", "gandiva", "parquet"
+            "arrow", "arrow_dataset", "arrow_flight", "arrow_python", "gandiva", "parquet"
         ] %}
-        {% set libs = libs + ["plasma"] %}  # [unix]
+        {% set libs = libs + ["arrow_flight_sql", "plasma"] %}     # [unix]
         {% for each_lib in libs %}
         # shared
         - test -f $PREFIX/lib/lib{{ each_lib }}.so                 # [linux]