build: replacement with vars just needs quotes

Simplify the code a little by using the SELF var instead
of hardcoding the type again.  This way some day the code
could be moved to common and reduce duplication further.

build/dvd.sh

@@ -48,7 +48,7 @@ setup_entropy ${STAGEDIR}/work
 
 UEFIBOOT=
 if [ ${PRODUCT_ARCH} = "amd64" -a -n "${PRODUCT_UEFI}" -a \
-    -z "${PRODUCT_UEFI%%*dvd*}" ]; then
+    -z "${PRODUCT_UEFI%%*"${SELF}"*}" ]; then
 	dd if=/dev/zero of=${STAGEDIR}/efiboot.img bs=4k count=200
 	DEV=$(mdconfig -a -t vnode -f ${STAGEDIR}/efiboot.img)
 	newfs_msdos -F 12 -m 0xf8 /dev/${DEV}

build/serial.sh

@@ -60,7 +60,7 @@ UEFIBOOT=
 GPTDUMMY=
 
 if [ ${PRODUCT_ARCH} = "amd64" -a -n "${PRODUCT_UEFI}" -a \
-    -z "${PRODUCT_UEFI%%*serial*}" ]; then
+    -z "${PRODUCT_UEFI%%*"${SELF}"*}" ]; then
 	UEFIBOOT="-p efi:=${STAGEDIR}/work/boot/boot1.efifat"
 	GPTDUMMY="-p freebsd-swap::512k"
 fi

build/vga.sh

@@ -59,7 +59,7 @@ UEFIBOOT=
 GPTDUMMY=
 
 if [ ${PRODUCT_ARCH} = "amd64" -a -n "${PRODUCT_UEFI}" -a \
-    -z "${PRODUCT_UEFI%%*vga*}" ]; then
+    -z "${PRODUCT_UEFI%%*"${SELF}"*}" ]; then
 	UEFIBOOT="-p efi:=${STAGEDIR}/work/boot/boot1.efifat"
 	GPTDUMMY="-p freebsd-swap::512k"
 fi

build/vm.sh

@@ -85,7 +85,7 @@ SWAPARGS=
 UEFIBOOT=
 
 if [ ${PRODUCT_ARCH} = "amd64" -a -n "${PRODUCT_UEFI}" -a \
-    -z "${PRODUCT_UEFI%%*vm*}" ]; then
+    -z "${PRODUCT_UEFI%%*"${SELF}"*}" ]; then
 	UEFIBOOT="-p efi:=${STAGEDIR}/boot/boot1.efifat"
 fi