pulseaudio: fix compilation with ICONV_FULL

Reordered check to check external iconv first.

Signed-off-by: Rosen Penev <rosenp@gmail.com>

sound/pulseaudio/patches/010-iconv.patch

@@ -0,0 +1,18 @@
+--- a/meson.build
++++ b/meson.build
+@@ -380,12 +380,11 @@ if dl_dep.found()
+ endif
+ 
+ have_iconv = false
+-if cc.has_function('iconv_open')
++iconv_dep = cc.find_library('iconv', required : false)
++have_iconv = iconv_dep.found()
++if not have_iconv and cc.has_function('iconv_open')
+   iconv_dep = dependency('', required : false)
+   have_iconv = true
+-else
+-  iconv_dep = cc.find_library('iconv', required : false)
+-  have_iconv = iconv_dep.found()
+ endif
+ if have_iconv
+   cdata.set('HAVE_ICONV', 1)