replace serum-dex with openbook-dex (#28873)

* replace serum-dex with openbook-dex

* force using master for anchor in downstream builds

* fix

scripts/build-downstream-projects.sh

@@ -80,17 +80,21 @@ spl() {
   )
 }
 
-serum_dex() {
+openbook_dex() {
   (
     set -x
-    rm -rf serum-dex
-    git clone https://github.com/project-serum/serum-dex.git
-    cd serum-dex
+    rm -rf openbook-dex
+    git clone https://github.com/openbook-dex/program.git openbook-dex
+    cd openbook-dex
 
     update_solana_dependencies . "$solana_ver"
     patch_crates_io_solana Cargo.toml "$solana_dir"
+    cat >> Cargo.toml <<EOF
+anchor-lang = { git = "https://github.com/coral-xyz/anchor.git", branch = "master" }
+EOF
     patch_crates_io_solana dex/Cargo.toml "$solana_dir"
     cat >> dex/Cargo.toml <<EOF
+anchor-lang = { git = "https://github.com/coral-xyz/anchor.git", branch = "master" }
 [workspace]
 exclude = [
     "crank",
@@ -109,4 +113,4 @@ EOF
 
 _ example_helloworld
 _ spl
-_ serum_dex
+_ openbook_dex