Revert "xbps-src: fix uchroot chroot-style to not overwrite XBPS_CHROOT_CMD_ARGS."

This reverts commit ba4bba2031.

common/chroot-style/uchroot.sh

@@ -2,13 +2,10 @@
 #
 # This chroot script uses xbps-uchroot(8).
 #
-if [ -n "$XBPS_TEMP_MASTERDIR" ]; then
-	ARGS="-O"
-fi
 readonly MASTERDIR="$1"
 readonly DISTDIR="$2"
 readonly HOSTDIR="$3"
-readonly EXTRA_ARGS="$ARGS $4"
+readonly EXTRA_ARGS="$4"
 readonly CMD="$5"
 shift 5
 

xbps-src

@@ -570,6 +570,15 @@ for i in REPOSITORY DESTDIR BUILDDIR SRCDISTDIR; do
     unset val
 done
 
+# A temporary masterdir requires xbps-uchroot(8) and -O to use overlayfs
+# on tmpfs (available with xbps-0.45).
+if [ -z "$IN_CHROOT" -a -n "$XBPS_TEMP_MASTERDIR" ]; then
+    if [ "$XBPS_CHROOT_CMD" != "uchroot" ]; then
+        echo "ERROR: -t requires XBPS_CHROOT_CMD=uchroot, exiting..."
+        exit 1
+    fi
+    export XBPS_CHROOT_CMD_ARGS="-O"
+fi
 #
 # Sanitize PATH.
 #