Merge #755: setup_environment: parallelize bitcoind build

1dbc4fd setup_environment: parallelize bitcoind build (Bruno Garcia)

Pull request description:

  See #752 (comment)

ACKs for top commit:
  achow101:
    ACK 1dbc4fd
  hebasto:
    ACK 1dbc4fd.

Tree-SHA512: 92dd01039b23ba291a9c97f7cd5508975913cbcb28b2f4507e6e83e0bcfd3780a1c60fef02793806aee55dbb6d077365be3ed64638a6a8102dfee2d164abb6ed

test/setup_environment.sh

@@ -444,10 +444,10 @@ if [[ -n ${build_bitcoind} ]]; then
 
     # Build bitcoind. This is super slow, but it is cached so it runs fairly quickly.
     pushd depends
-    make NO_QT=1 NO_QR=1 NO_ZMQ=1 NO_UPNP=1 NO_NATPMP=1 NO_USDT=1
+    make -j $(nproc) NO_QT=1 NO_QR=1 NO_ZMQ=1 NO_UPNP=1 NO_NATPMP=1 NO_USDT=1
     popd
 
     # Do the build
     cmake -B build --toolchain depends/x86_64-pc-linux-gnu/toolchain.cmake -DBUILD_TESTS=OFF -DBUILD_BENCH=OFF
-    cmake --build build --target bitcoind
+    cmake --build build -j $(nproc) --target bitcoind
 fi