tools: mkeficapsule: use u-boot UUID library

Replace the use of libuuid with U-Boot's own UUID library. This prepares
us to add support for generating v5 GUIDs.

Signed-off-by: Caleb Connolly <caleb.connolly@linaro.org>
diff --git a/tools/Makefile b/tools/Makefile
index 6a4280e..ee08a96 100644
--- a/tools/Makefile
+++ b/tools/Makefile
@@ -246,12 +246,12 @@
 
 HOSTCFLAGS_mkeficapsule.o += \
 	$(shell pkg-config --cflags gnutls 2> /dev/null || echo "")
-HOSTCFLAGS_mkeficapsule.o += \
-	$(shell pkg-config --cflags uuid 2> /dev/null || echo "")
 HOSTLDLIBS_mkeficapsule += \
 	$(shell pkg-config --libs gnutls 2> /dev/null || echo "-lgnutls")
-HOSTLDLIBS_mkeficapsule += \
-	$(shell pkg-config --libs uuid 2> /dev/null || echo "-luuid")
+mkeficapsule-objs := generated/lib/uuid.o \
+	generated/lib/sha1.o \
+	$(LIBFDT_OBJS) \
+	mkeficapsule.o
 hostprogs-$(CONFIG_TOOLS_MKEFICAPSULE) += mkeficapsule
 
 mkfwumdata-objs := mkfwumdata.o generated/lib/crc32.o