Correctly skip static linking test on shrplib perls

Author: Leont

t/03-xsstatic.t

@@ -13,7 +13,7 @@ use Test::More;
 
 plan skip_all => "ExtUtils::CBuilder not installed or couldn't find a compiler"
   unless have_compiler();
-plan skip_all => 'Shared perl library' if $Config{useshrplib} eq 'define';
+plan skip_all => 'Shared perl library' if $Config{useshrplib} eq 'true';
 plan skip_all => $^O if $^O =~ m!^(MSWin32|cygwin|haiku)$!;
 my @tests = list_static();
 plan skip_all => "No tests" unless @tests;