Remove old versions of mpfr.

Change-Id: If4cb73f8131818e422c69ba477cabf091c7dae7f
diff --git a/mpfr-2.3.0.tar.bz2 b/mpfr-2.3.0.tar.bz2
deleted file mode 100644
index d9f6d53..0000000
--- a/mpfr-2.3.0.tar.bz2
+++ /dev/null
Binary files differ
diff --git a/mpfr-2.4.1.tar.bz2 b/mpfr-2.4.1.tar.bz2
deleted file mode 100644
index 109967d..0000000
--- a/mpfr-2.4.1.tar.bz2
+++ /dev/null
Binary files differ
diff --git a/mpfr-2.4.2.tar.bz2 b/mpfr-2.4.2.tar.bz2
deleted file mode 100644
index d72de33..0000000
--- a/mpfr-2.4.2.tar.bz2
+++ /dev/null
Binary files differ