enforce compilation of freetype with 32 bit on i686 systems

In case of cross compilation on x86-64 systems for i686 targets, Freetype is not compiled for 32 bit.
See also: https://github.com/AdoptOpenJDK/TSC/issues/71#issuecomment-475451019

sbin/prepareWorkspace.sh

@@ -224,9 +224,14 @@ checkingAndDownloadingFreeType()
       pngArg="--with-png=no";
     fi
 
+    local freetypeCC="";
+    if [[ "${BUILD_CONFIG[OS_ARCHITECTURE]}" == "i686" ]] || [[ "${BUILD_CONFIG[OS_ARCHITECTURE]}" == "i386" ]] ; then
+        freetypeCC="gcc -m32";
+    fi
+
     # We get the files we need at $WORKING_DIR/installedfreetype
     # shellcheck disable=SC2046
-    if ! (bash ./configure --prefix="${BUILD_CONFIG[WORKSPACE_DIR]}/${BUILD_CONFIG[WORKING_DIR]}"/installedfreetype "${pngArg}" "${BUILD_CONFIG[FREETYPE_FONT_BUILD_TYPE_PARAM]}" && ${BUILD_CONFIG[MAKE_COMMAND_NAME]} all && ${BUILD_CONFIG[MAKE_COMMAND_NAME]} install); then
+    if ! (CC="${freetypeCC}" bash ./configure --prefix="${BUILD_CONFIG[WORKSPACE_DIR]}/${BUILD_CONFIG[WORKING_DIR]}"/installedfreetype "${pngArg}" "${BUILD_CONFIG[FREETYPE_FONT_BUILD_TYPE_PARAM]}" && ${BUILD_CONFIG[MAKE_COMMAND_NAME]} all && ${BUILD_CONFIG[MAKE_COMMAND_NAME]} install); then
       # shellcheck disable=SC2154
       echo "Failed to configure and build libfreetype, exiting"
       exit;