use private dir for carla and zplugins

meson.build

@@ -131,8 +131,9 @@ carla_installation = custom_target (
   output: 'carla-native-plugin.pc',
   input: carla_src_zip,
   command: [
-    make_carla, '@INPUT@', carla_git_ver, '&&',
-    'cp', temp_carla_pkgconfig_path / 'carla-native-plugin.pc', '@OUTPUT@',
+    make_carla, '@INPUT@', carla_git_ver, '@PRIVATE_DIR@', '&&',
+    'cp', temp_carla_pkgconfig_path / 'carla-native-plugin.pc',
+    '@OUTPUT@',
     ],
   install: false,
   )
@@ -144,7 +145,8 @@ zplugins_installation = custom_target (
   command: [
     'rm', '-rf', '@OUTPUT@', '&&',
     make_zplugins, zplugins_src_tarball,
-    temp_zplugins_prefix, temp_zplugins_suffix, '&&',
+    temp_zplugins_prefix, temp_zplugins_suffix,
+    '@PRIVATE_DIR@', '&&',
     'mv', temp_zplugins_prefix / temp_zplugins_suffix,
     '@OUTPUT@'
     ],

scripts/make_carla.sh.in

@@ -4,6 +4,7 @@ set -e
 
 # full path to carla source zip
 carla_source_zip="$1"
+private_dir="$2"
 
 prefix="@TEMP_CARLA_PREFIX@"
 carla_git_ver="@CARLA_GIT_VER@"
@@ -14,7 +15,9 @@ export PKG_CONFIG_PATH=$prefix/lib/pkgconfig
 if pkg-config --atleast-version=2.1 carla-native-plugin ; then
   echo "latest carla installed" ;
 fi
-tempdir=`mktemp -d`
-unzip -o "$carla_source_zip" -d "$tempdir"
-cd "$tempdir/Carla-$carla_git_ver"
+
+rm -rf $private_dir
+mkdir -p $private_dir
+unzip -o "$carla_source_zip" -d "$private_dir"
+cd "$private_dir/Carla-$carla_git_ver"
 make -j4 && make install PREFIX="$prefix" LIBDIR=$prefix/@LIBDIR@

scripts/make_zplugins.sh.in

@@ -9,17 +9,19 @@ prefix="$2"
 # lv2 dir suffix after the prefix, eg 'lib/lv2'
 lv2_dir="$3"
 
+private_dir="$4"
+
 meson_bin="@MESON_BIN@"
 zplugins_ver="@ZPLUGINS_VER@"
 
 echo `pwd`
 
 rm -rf "$prefix/$lv2_dir"
-tempdir=`mktemp -d`
-tar xf $tarball -C $tempdir
-cd $tempdir/zplugins-$zplugins_ver
+rm -rf $private_dir
+mkdir -p $private_dir
+tar xf $tarball -C $private_dir
+cd $private_dir/zplugins-$zplugins_ver
 $meson_bin build --buildtype=debugoptimized \
   --prefix=$prefix
 ninja -C build
 ninja -C build install
-rm -rf $tempdir