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

As it's automatically set by the cmake script.

.github/workflows/ci-ifcopenshell-docker.yml

@@ -44,7 +44,6 @@ jobs:
         cmake \
          -DCMAKE_C_COMPILER_LAUNCHER=ccache \
          -DCMAKE_CXX_COMPILER_LAUNCHER=ccache \
-         -DCMAKE_CXX_STANDARD=17 \
          -DCMAKE_INSTALL_PREFIX=$PWD/install/ \
          -DCMAKE_BUILD_TYPE=Release \
          -DCMAKE_PREFIX_PATH=/usr \

.github/workflows/ci.yml

@@ -172,7 +172,6 @@ jobs:
           
           mkdir build && cd build
           cmake \
-               -DCMAKE_CXX_STANDARD=17 \
                -DCMAKE_BUILD_TYPE=Release \
                -DCMAKE_PREFIX_PATH=/usr \
                -DCMAKE_SYSTEM_PREFIX_PATH=/usr \

.github/workflows/release.yml

@@ -46,7 +46,6 @@ jobs:
           mkdir build && cd build
           cmake \
            -DCMAKE_INSTALL_PREFIX=$PWD/install/ \
-           -DCMAKE_CXX_STANDARD=17 \
            -DCMAKE_BUILD_TYPE=Release \
            -DCMAKE_PREFIX_PATH=/usr \
            -DCMAKE_SYSTEM_PREFIX_PATH=/usr \

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%" ^

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 \

nix/build-all.py

@@ -1330,7 +1330,6 @@ os.makedirs(executables_dir, exist_ok=True)
 
 
 cmake_args = [
-    "-DCMAKE_CXX_STANDARD=17",
     "-DUSE_MMAP=OFF",
     "-DBUILD_EXAMPLES=OFF",
     "-DBUILD_SHARED_LIBS=" + OFF_ON[not BUILD_STATIC],