Use a valgrind suppressions file to work around libstd uninit access

Author: TheBlueMatt

genbindings.sh

@@ -349,7 +349,7 @@ if $RUN_CPP_TESTS; then
   if [ "$2" = "true" ]; then
     g++ $LOCAL_CFLAGS -std=c++11 -Wall -g -pthread -DREAL_NET -I../ldk-net ldk_net.o demo.cpp target/debug/libldk.a -ldl -lm
     if [ -x "`which valgrind`" -a "$(uname -m)" != "ppc64le" ]; then
-      valgrind --error-exitcode=4 --memcheck:leak-check=full --show-leak-kinds=all ./a.out
+      valgrind --suppressions=valgrind-suppressions.txt --error-exitcode=4 --memcheck:leak-check=full --show-leak-kinds=all ./a.out
       echo
     else
       echo "WARNING: Please install valgrind for more testing"

lightning-c-bindings/valgrind-suppressions.txt

@@ -0,0 +1,6 @@
+{
+   Apparently rust stdlib accesses uninitialized values while debug'ing a duration
+   Memcheck:Cond
+   ...
+   fun:_ZN57_$LT$core..time..Duration$u20$as$u20$core..fmt..Debug$*
+}