Force siphash24 hash algorithm when cross-compiling

When cross-compiling, the hash function is forced to be FNV because the
configure script defines `HAVE_ALIGNED_REQUIRED` which is then used by
pyhash.h to change the default to FNV (see conda-forge#718)

This commit fixes the issue by specifying siphash24 to the configure
script when cross-compiling.

recipe/build_base.sh

@@ -249,6 +249,10 @@ _common_configure_args+=(--with-tcltk-includes="-I${PREFIX}/include")
 _common_configure_args+=("--with-tcltk-libs=-L${PREFIX}/lib -ltcl8.6 -ltk8.6")
 _common_configure_args+=(--with-platlibdir=lib)
 
+if [[ "${CONDA_BUILD_CROSS_COMPILATION}" == "1" ]]; then
+  _common_configure_args+=(--with-hash-algorithm=siphash24)
+fi
+
 # Add more optimization flags for the static Python interpreter:
 declare -a PROFILE_TASK=()
 if [[ ${_OPTIMIZED} == yes ]]; then

recipe/meta.yaml

@@ -4,7 +4,7 @@
 {% set ver2 = '.'.join(version.split('.')[0:2]) %}
 {% set ver2nd = ''.join(version.split('.')[0:2]) %}
 {% set ver3nd = ''.join(version.split('.')[0:3]) %}
-{% set build_number = 0 %}
+{% set build_number = 1 %}
 
 # this makes the linter happy
 {% set channel_targets = channel_targets or 'conda-forge main' %}