libmpc: changed to always build at stage 0 and 1

Note:

GCC >= 4.5 requires the MPC library in order to build
see: ttp://gcc.gnu.org/gcc-4.5/changes.html

scientific/libmpc/libmpc.desc

@@ -2,7 +2,7 @@
 [COPY] This copyright note is auto-generated by ./scripts/Create-CopyPatch.
 [COPY]
 [COPY] Filename: package/.../libmpc/libmpc.desc
-[COPY] Copyright (C) 2010 The OpenSDE Project
+[COPY] Copyright (C) 2010 - 2011 The OpenSDE Project
 [COPY]
 [COPY] More information can be found in the files COPYING and README.
 [COPY]
@@ -30,6 +30,6 @@
 [L] LGPL
 [S] Stable
 [V] 0.8.2
-[P] X -?---5---9 102.255
+[P] X 01-3-5---9 102.255
 
 [D] 3196113706 mpc-0.8.2.tar.gz http://www.multiprecision.org/mpc/download/