Ports: Allow harfbuzz to be built with cmake 3.18.4

CMake defaults to the current directory if the source or build 
directory is not specified. Harfbuzz builds into an alternate 
directory so it fails. This change specifies the directory prior 
to any additional parameters so the build can succeed with 
cmake 3.18.4.

Ports/harfbuzz/package.sh

@@ -9,7 +9,7 @@ auth_type=sha256
 
 configure() {
     run mkdir -p build
-    run sh -c "cd build && cmake ${configopts[@]} .."
+    run sh -c "cd build && cmake .. ${configopts[@]}"
 }
 
 build() {