MISC: build zita-resampler in macbuild.sh

Signed-off-by: Stefan Westerfeld <stefan@space.twc.de>

misc/macbuild.sh

 #!/bin/bash
 set -Eeuo pipefail -x
 
+# install dependencies
 brew install autoconf-archive automake libsndfile fftw mpg123 libgcrypt
+
+# build zita-resampler
+git clone https://github.com/digital-stage/zita-resampler
+cd zita-resampler
+cmake .
+make install
+cd ..
+
+# build audiowmark
 ./autogen.sh
 make
 make check