mpc: Fix meta.yaml about meta-data:

license is LGPL (>=3), added license_family, description,
doc_url and dev_url.

mpc/meta.yaml

@@ -7,6 +7,9 @@ source:
   url: http://www.multiprecision.org/mpc/download/mpc-1.0.3.tar.gz
   sha1: b8be66396c726fdc36ebb0f692ed8a8cca3bcc66
 
+build:
+  number: 0
+
 requirements:
   build:
     - gmp
@@ -17,5 +20,15 @@ requirements:
 
 about:
   home: http://www.multiprecision.org/
-  license: GPL
+  license: LGPL (>= 3)
+  license_family: LGPL
   summary: Gnu Mpc is a C library for the arithmetic of complex numbers with arbitrarily high precision and correct rounding of the result.
+  description: |
+    Gnu Mpc is a C library for the arithmetic of complex numbers with
+    arbitrarily high precision and correct rounding of the result. It
+    extends the principles of the IEEE-754 standard for fixed precision
+    real floating point numbers to complex numbers, providing well-defined
+    semantics for every operation. At the same time, speed of operation
+    at high precision is a major design goal.
+  doc_url: http://www.multiprecision.org/index.php?prog=mpc&page=html
+  dev_url: http://gforge.inria.fr/scm/?group_id=131