replace config hack with proper meson syntax

meson.build

@@ -66,7 +66,7 @@ conf.set('HAVE_SYS_STAT_H', cc.has_header('sys/stat.h'))
 conf.set('HAVE_SYS_TYPES_H', cc.has_header('sys/types.h'))
 conf.set('HAVE_UNISTD_H', cc.has_header('unistd.h'))
 
-configure_file(output : 'config.h', configuration : conf)
+configure_file(output : 'config.h', configuration : conf, install : true, install_dir : 'calfbox')
 
 
 libcalfbox_sources = [
@@ -165,7 +165,7 @@ executable('sfzload',
 
 #basename -a *.h
 install_headers(
-    meson.current_build_dir()+'/config.h',
+    #meson.current_build_dir()+'/config.h',
     'calfbox/app.h',
     'calfbox/auxbus.h',
     'calfbox/biquad-float.h',