Merge pull request #21 from GuillaumeGomez/mpc-1.3.1

Add `mpc-1.3.1` file

Author: marcoieni

files/rustc/gcc.toml

@@ -9,3 +9,9 @@ name = "rustc/gcc/mpfr-4.2.2.tar.bz2"
 source = "https://www.mpfr.org/mpfr-current/mpfr-4.2.2.tar.bz2"
 sha256 = "9ad62c7dc910303cd384ff8f1f4767a655124980bb6d8650fe62c815a231bb7b"
 license = "GNU General Public License"
+
+[[files]]
+name = "rustc/gcc/mpc-1.3.1.tar.gz"
+source = "https://ftp.gnu.org/gnu/mpc/mpc-1.3.1.tar.gz"
+sha256 = "ab642492f5cf882b74aa0cb730cd410a81edcdbec895183ce930e706c1c759b8"
+license = "GNU General Public License"