Adds a suppression file "Invalid Read"s by __gmpn_copyi.

To use this you can call valgrind via e.g.
    valgrind --suppressions=flint.supp ./build/fmpz_poly/test/t-mul_KS

Author: SPancratz

flint.supp

@@ -0,0 +1,16 @@
+{
+   MPIR_MUL
+   Memcheck:Addr8
+   fun:__gmpn_copyi
+   fun:__gmpn_mul
+   fun:_fmpz_poly_mul_KS
+}
+
+{
+   MPIR_MUL_N
+   Memcheck:Addr8
+   fun:__gmpn_copyi
+   fun:__gmpn_mul_n
+   fun:_fmpz_poly_mul_KS
+}
+