systemlibs: unbundle hwloc

Signed-off-by: Jason Zaman <jason@perfinion.com>

third_party/hwloc/BUILD.system

@@ -0,0 +1,22 @@
+# hwloc: Portable Hardware Locality Library
+
+licenses(["notice"])
+
+config_setting(
+    name = "with_numa_support",
+    define_values = {"with_numa_support": "true"},
+)
+
+filegroup(
+    name = "COPYING",
+    visibility = ["//visibility:public"],
+)
+
+cc_library(
+    name = "hwloc",
+    linkopts = select({
+        ":with_numa_support": ["-lhwloc"],
+        "//conditions:default": [],
+    }),
+    visibility = ["//visibility:public"],
+)

third_party/hwloc/workspace.bzl

@@ -12,4 +12,5 @@ def repo():
         sha256 = "64def246aaa5b3a6e411ce10932a22e2146c3031b735c8f94739534f06ad071c",
         strip_prefix = "hwloc-2.0.3",
         build_file = "//third_party/hwloc:BUILD.bazel",
+        system_build_file = "//third_party/hwloc:BUILD.system",
     )

third_party/systemlibs/syslibs_configure.bzl

@@ -25,6 +25,7 @@ VALID_LIBS = [
     "gast_archive",
     "gif_archive",
     "grpc",
+    "hwloc",
     "icu",
     "jpeg",
     "jsoncpp_git",