Remove unnecessary configure options

* ``--enable-big-digits=30`` is now default for wasm platforms, see emmatyping#20
* ``--with-ensurepip=no`` is now default for emscripten platform, see emmatyping#23
* ``--disable-ipv6`` was never necessary, we have
  ``ac_cv_buggy_getaddrinfo=no``

Author: tiran

build-python-host-emscripten.sh

@@ -10,7 +10,7 @@ embuilder build zlib
 
 pushd cpython/builddir/host
 cp ../../../config.site-wasm config.site-wasm
-CONFIG_SITE=config.site-wasm READELF=true ZLIB_LIBS="-s USE_ZLIB" emconfigure ../../configure -C --without-pymalloc --enable-big-digits=30 --with-pydebug --with-ensurepip=no --disable-ipv6 --host=wasm32-unknown-emscripten --build=$(../../config.guess) --with-build-python=$(pwd)/../build/python --with-freeze-module=$(pwd)/../build/Programs/_freeze_module
+CONFIG_SITE=config.site-wasm READELF=true ZLIB_LIBS="-s USE_ZLIB" emconfigure ../../configure -C --without-pymalloc --with-pydebug --host=wasm32-unknown-emscripten --build=$(../../config.guess) --with-build-python=$(pwd)/../build/python --with-freeze-module=$(pwd)/../build/Programs/_freeze_module
 
 # Use Setup.stdlib and force rebuild of Makefile
 ln -sfr Modules/Setup.stdlib Modules/Setup.local