src/doc/bootstrap: Use sage-get-system-packages so that ENABLE_SYSTEM_SITEPACKAGES is respected

Author: Matthias Koeppe

src/doc/bootstrap

@@ -37,9 +37,8 @@ for SYSTEM in arch debian fedora homebrew opensuse; do
     DEVELOP_SYSTEM_PACKAGES=
     for PKG_BASE in $(sage-package list --has-file distros/$SYSTEM.txt); do
                 PKG_SCRIPTS=build/pkgs/$PKG_BASE
-                SYSTEM_PACKAGES_FILE=$PKG_SCRIPTS/distros/$SYSTEM.txt
                 PKG_TYPE=$(cat $PKG_SCRIPTS/type)
-                PKG_SYSTEM_PACKAGES=$(echo $(${STRIP_COMMENTS} $SYSTEM_PACKAGES_FILE))
+                PKG_SYSTEM_PACKAGES=$(sage-get-system-packages $SYSTEM $PKG_BASE)
                 if [ -n "PKG_SYSTEM_PACKAGES" ]; then
                     if [ -f $PKG_SCRIPTS/spkg-configure.m4 ]; then
                        case "$PKG_BASE:$PKG_TYPE" in