build/make/install: Set SAGE_SPKG_WHEELS also here so that script packages still work

Author: Matthias Koeppe

build/make/install

@@ -19,6 +19,11 @@ export SAGE_SHARE="$SAGE_LOCAL/share"
 export SAGE_PKGCONFIG="$SAGE_LOCAL/lib/pkgconfig"
 export SAGE_LOGS="$SAGE_ROOT/logs/pkgs"
 export SAGE_SPKG_INST="$SAGE_LOCAL/var/lib/sage/installed"
+# Following line is duplicated here from build/bin/sage-spkg.
+# because the setting is also needed by some script packages.
+# The line here will be removed in #29386 (install script packages
+# via sage-spkg).
+export SAGE_SPKG_WHEELS="$SAGE_LOCAL/var/lib/sage/wheels"
 
 if [ -z "${SAGE_ORIG_PATH_SET}" ]; then
     SAGE_ORIG_PATH=$PATH && export SAGE_ORIG_PATH