Add libxslt to the GN build

third_party/libxslt/BUILD.gn

Index: third_party/libxslt/BUILD.gn
diff --git a/third_party/libxslt/BUILD.gn b/third_party/libxslt/BUILD.gn
new file mode 100644
index 0000000000000000000000000000000000000000..f543901b40317e27ce695bd728716566fa7e093c
--- /dev/null
+++ b/third_party/libxslt/BUILD.gn
@@ -0,0 +1,80 @@
+# Copyright 2014 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+config("libxslt_config") {
+  defines = [ "LIBXSLT_STATIC" ]
+  include_dirs = [ "." ]
+}
+
+static_library("libxslt") {
+  sources = [
+    "libxslt/attributes.c",
+    "libxslt/attributes.h",
+    "libxslt/attrvt.c",
+    "libxslt/documents.c",
+    "libxslt/documents.h",
+    "libxslt/extensions.c",
+    "libxslt/extensions.h",
+    "libxslt/extra.c",
+    "libxslt/extra.h",
+    "libxslt/functions.c",
+    "libxslt/functions.h",
+    "libxslt/imports.c",
+    "libxslt/imports.h",
+    "libxslt/keys.c",
+    "libxslt/keys.h",
+    "libxslt/libxslt.h",
+    "libxslt/namespaces.c",
+    "libxslt/namespaces.h",
+    "libxslt/numbers.c",
+    "libxslt/numbersInternals.h",
+    "libxslt/pattern.c",
+    "libxslt/pattern.h",
+    "libxslt/preproc.c",
+    "libxslt/preproc.h",
+    "libxslt/security.c",
+    "libxslt/security.h",
+    "libxslt/templates.c",
+    "libxslt/templates.h",
+    "libxslt/transform.c",
+    "libxslt/transform.h",
+    "libxslt/trio.h",
+    "libxslt/triodef.h",
+    "libxslt/variables.c",
+    "libxslt/variables.h",
+    "libxslt/win32config.h",
+    "libxslt/xslt.c",
+    "libxslt/xslt.h",
+    "libxslt/xsltconfig.h",
+    "libxslt/xsltexports.h",
+    "libxslt/xsltInternals.h",
+    "libxslt/xsltlocale.c",
+    "libxslt/xsltlocale.h",
+    "libxslt/xsltutils.c",
+    "libxslt/xsltutils.h",
+    "libxslt/xsltwin32config.h",
+    "linux/config.h",
+    "mac/config.h",
+  ]
+
+  configs -= [ "//build/config/compiler:chromium_code" ]
+  configs += [ "//build/config/compiler:no_chromium_code" ]
+  direct_dependent_configs = [ ":libxslt_config" ]
+
+  if (is_linux) {
+    include_dirs = [ "linux" ]
+  } else if (is_win) {
+    include_dirs = [ "win32" ]
+  } else if (is_mac) {
+    include_dits = [ "mac" ]
+  }
+
+  if (is_clang) {
+    cflags = [ "-Wno-pointer-sign" ]
+  }
+
+  deps = [
+    "//third_party/libxml",
+  ]
+}