workaround broken iconv detection

Index: meson.build
--- meson.build.orig
+++ meson.build
@@ -20,16 +20,7 @@ conf.set_quoted('VERSION', meson.project_version())
 
 conf.set('HAVE_STRNDUP', cc.has_function('strndup', prefix: '#define _GNU_SOURCE\n#include <string.h>'))
 
-iconv = get_option('iconv')
-if iconv.disabled()
-  iconv = false
-elif cc.has_function('iconv')
-  iconv = true
-elif iconv.auto()
-  iconv = false
-else
-  error('iconv() not available')
-endif
+iconv = true
 conf.set('HAVE_ICONV', iconv)
 
 configure_file(output: 'config.h', configuration: conf)