Convert third_party source sets to static libraries.

third_party/wayland/BUILD.gn

Index: third_party/wayland/BUILD.gn
diff --git a/third_party/wayland/BUILD.gn b/third_party/wayland/BUILD.gn
index ecb81e04a85ce34352fd3207b4a21b9caae832c0..b77082766d1b7fab68ede3887488a204123c53be 100644
--- a/third_party/wayland/BUILD.gn
+++ b/third_party/wayland/BUILD.gn
@@ -10,7 +10,7 @@ config("wayland_config") {
   ]
 }
 
-source_set("wayland_util") {
+static_library("wayland_util") {
   sources = [
     "src/src/wayland-util.c",
     "src/src/wayland-util.h",
@@ -22,7 +22,7 @@ source_set("wayland_util") {
   public_configs = [ ":wayland_config" ]
 }
 
-source_set("wayland_private") {
+static_library("wayland_private") {
   sources = [
     "src/src/connection.c",
     "src/src/wayland-os.c",
@@ -38,7 +38,7 @@ source_set("wayland_private") {
   ]
 }
 
-source_set("wayland_protocol") {
+static_library("wayland_protocol") {
   sources = [
     "protocol/wayland-protocol.c",
   ]
@@ -53,7 +53,7 @@ source_set("wayland_protocol") {
   public_configs = [ ":wayland_config" ]
 }
 
-source_set("wayland_server") {
+static_library("wayland_server") {
   sources = [
     "include/protocol/wayland-server-protocol.h",
     "src/src/event-loop.c",
@@ -76,7 +76,7 @@ source_set("wayland_server") {
   public_configs = [ ":wayland_config" ]
 }
 
-source_set("wayland_client") {
+static_library("wayland_client") {
   sources = [
     "include/protocol/wayland-client-protocol.h",
     "src/src/wayland-client.c",