Distro builders: install patch for mklove

packaging/alpine/build-alpine.sh

@@ -9,7 +9,7 @@ if [ "$1" = "--in-docker" ]; then
     # Runs in docker, performs the actual build.
     shift
 
-    apk add bash curl gcc g++ make musl-dev linux-headers bsd-compat-headers git python3 perl
+    apk add bash curl gcc g++ make musl-dev linux-headers bsd-compat-headers git python3 perl patch
 
     git clone /v /librdkafka
 

packaging/tools/build-debian.sh

@@ -28,7 +28,7 @@ fi
 set -u
 
 apt-get update
-apt-get install -y gcc g++ zlib1g-dev python3 git-core make
+apt-get install -y gcc g++ zlib1g-dev python3 git-core make patch
 
 
 # Copy the librdkafka git archive to a new location to avoid messing