unbundle: add GN file for libjpeg

build/linux/unbundle/libjpeg.gn

Index: build/linux/unbundle/libjpeg.gn
diff --git a/build/linux/unbundle/libevent.gn b/build/linux/unbundle/libjpeg.gn
similarity index 57%
copy from build/linux/unbundle/libevent.gn
copy to build/linux/unbundle/libjpeg.gn
index 47e48e9b9927cd25045b67faae928961863a0a18..81ce3f97d7e3fdab63ab311896ca3d26d8dbbcba 100644
--- a/build/linux/unbundle/libevent.gn
+++ b/build/linux/unbundle/libjpeg.gn
@@ -4,14 +4,20 @@
 
 import("//build/shim_headers.gni")
 
-shim_headers("libevent_shim") {
+shim_headers("libjpeg_shim") {
   root_path = "."
-  headers = [ "event.h" ]
+  headers = [ "jpeglib.h" ]
 }
 
-source_set("libevent") {
+source_set("libjpeg") {
   deps = [
-    ":libevent_shim",
+    ":libjpeg_shim",
   ]
-  libs = [ "event" ]
+  libs = [ "jpeg" ]
+}
+
+source_set("simd") {
+}
+
+source_set("simd_asm") {
 }