Add path prefix for patches

Change-Id: I5bfd82e281916884f0542838885f2d42262af4af

external/BUILD

diff --git a/external/BUILD b/external/BUILD
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/external/BUILD

rules/repos.bzl

diff --git a/rules/repos.bzl b/rules/repos.bzl
index dcf8658..f7140b1 100644
--- a/rules/repos.bzl
+++ b/rules/repos.bzl
@@ -21,8 +21,8 @@
             "https://github.com/hdl/bazel_rules_hdl/archive/b58d34add60108ae20d273ee480193b25e96d000.tar.gz",
         ],
         patches = [
-            "0001-Update-version-of-Googletest-for-bazel-compatitibili.patch",
-            "0002-SystemC-support-for-verilator.patch",
+            "@kelvin_hw//external:0001-Update-version-of-Googletest-for-bazel-compatitibili.patch",
+            "@kelvin_hw//external:0002-SystemC-support-for-verilator.patch",
         ],
     )