build scripts - don't provide cxx-std-17

As it's automatically set by the cmake script.

conda/build.bat

@@ -9,7 +9,6 @@ set LIBXML2="%LIBRARY_PREFIX%/lib/libxml2.lib"
 cmake -G "Ninja" ^
  -D SCHEMA_VERSIONS="2x3;4;4x1;4x3_add2" ^
  -D CMAKE_BUILD_TYPE:STRING=Release ^
- -D CMAKE_CXX_STANDARD=17 ^
  -D CMAKE_INSTALL_PREFIX:FILEPATH="%LIBRARY_PREFIX%" ^
  -D CMAKE_PREFIX_PATH:FILEPATH="%LIBRARY_PREFIX%" ^
  -D CMAKE_SYSTEM_PREFIX_PATH:FILEPATH="%LIBRARY_PREFIX%" ^
@@ -43,7 +42,7 @@ cmake -G "Ninja" ^
  -D Boost_INCLUDE_DIR:FILEPATH="%LIBRARY_PREFIX%\include" ^
  -D Boost_USE_STATIC_LIBS:BOOL=OFF ^
  ../cmake
- 
+
 if errorlevel 1 exit 1
 
 ninja install -j 1
@@ -52,4 +51,4 @@ if errorlevel 1 exit 1
 
 python %RECIPE_DIR%/update_version_init.py %PKG_VERSION% %SP_DIR%/ifcopenshell/__init__.py
 
-if errorlevel 1 exit 1
+if errorlevel 1 exit 1

conda/build.sh

@@ -16,7 +16,6 @@ cmake ${CMAKE_ARGS} -G Ninja \
  -DSCHEMA_VERSIONS="2x3;4;4x1;4x3_add2" \
  -DCMAKE_BUILD_TYPE=Release \
  -DCMAKE_INSTALL_PREFIX=$PREFIX \
- -DCMAKE_CXX_STANDARD=17 \
   ${CMAKE_PLATFORM_FLAGS[@]} \
  -DCMAKE_PREFIX_PATH=$PREFIX \
  -DCMAKE_SYSTEM_PREFIX_PATH=$PREFIX \