libmpc: always run make check

Correctness is pretty important here, and it doesn't take too long.

Signed-off-by: Jack Nagel <jacknagel@gmail.com>

Formula/libmpc.rb

@@ -1,8 +1,8 @@
 require 'formula'
 
 class Libmpc < Formula
-  url 'http://multiprecision.org/mpc/download/mpc-0.9.tar.gz'
   homepage 'http://multiprecision.org'
+  url 'http://multiprecision.org/mpc/download/mpc-0.9.tar.gz'
   md5 '0d6acab8d214bd7d1fbbc593e83dd00d'
 
   depends_on 'gmp'
@@ -11,6 +11,7 @@ class Libmpc < Formula
   def install
     system "./configure", "--disable-dependency-tracking", "--prefix=#{prefix}"
     system "make"
+    system "make check"
     system "make install"
   end
 end