External libs - update build scripts on mac and Linux

This adds instructions to pre-build the emergent behaviour synth Ugen plugins on
mac, and updates the corresponding instructions on Linux to account for the new
path to the native plugins.

Author: ethancrawford

app/external/mac_build_externals.sh

@@ -13,5 +13,7 @@ echo "Building sp_midi..."
 cmake  --build . --target sp_midi
 echo "Building aubio onset..."
 cmake --build . --target aubio
+echo "Building supercollider-plugins..."
+cmake --build . --target supercollider-plugins
 
 cd "${SCRIPT_DIR}"

app/linux-prebuild.sh

@@ -33,8 +33,8 @@ cp ${SCRIPT_DIR}/external/build/sp_midi-prefix/src/sp_midi-build/*.so ${SCRIPT_D
 cp "${SCRIPT_DIR}/external/build/aubio-prefix/src/aubio-build/aubio_onset" "${SCRIPT_DIR}/server/native/"
 
 echo "Copying extra UGens to the server..."
-mkdir -p "${SCRIPT_DIR}/../../server/native/plugins"
-cp ${SCRIPT_DIR}/external/build/supercollider-plugins-prefix/src/supercollider-plugins-build/*.so ${SCRIPT_DIR}/../../server/native/plugins
+mkdir -p "${SCRIPT_DIR}/../../server/native/supercollider/plugins"
+cp ${SCRIPT_DIR}/external/build/supercollider-plugins-prefix/src/supercollider-plugins-build/*.so ${SCRIPT_DIR}/../../server/native/supercollider/plugins
 
 #dont remove ruby-aubio-prerelease, as needed in linux build
 #it is removed in the windows-prebuild

app/mac-prebuild.sh

@@ -60,6 +60,9 @@ ln -s supercollider/scsynth scsynth
 mv supercollider/extra-plugins/* supercollider/plugins/
 rm -rf supercollider/extra-plugins
 
+echo "Copying extra UGens to the server..."
+cp ${SCRIPT_DIR}/external/build/supercollider-plugins-prefix/src/supercollider-plugins-build/*.scx ${SCRIPT_DIR}/server/native/supercollider/plugins
+
 echo "Compiling native ruby extensions..."
 $RUBY "${SCRIPT_DIR}/server/ruby/bin/compile-extensions.rb"