perl: Enable crypt() for all libc implementations

Signed-off-by: Marcel Denia <naoir@gmx.net>

lang/perl/files/libc.config

@@ -3,11 +3,9 @@
 	ldflags="$ldflags -L$owrt:staging_dir/lib"
 }
 
-# uclibc does not provide crypt_r(). Enable crypt() usage for glibc builds only
-($owrt:libc ne 'glibc') {
+# uclibc does not provide crypt_r().
+($owrt:libc eq 'uclibc') {
 	crypt_r_proto='0'
-	i_crypt='undef'
-	d_crypt='undef'
 	d_crypt_r='undef'
 }