Log Message:
protobuf-c: updated to 1.3.2

protobuf-c (1.3.2)
* Use protobuf 3.7.1 in the Travis-CI environment.
* Fix test suite build failure on newer versions of protobuf.
* Fix proto3 repeated scalar field default packing behavior.
* Fix out-of-bounds read in scan_length_prefixed_data().
* Fix -Wdeclaration-after-statement warning in parse_oneof_member().
* Fix SIGSEGV in protobuf_c_message_check() on messages with unpopulated
  oneof member.
* Do not allow tag values of 0 in protobuf messages, as these are not
  allowed by proto2 or proto3.

protobuf-c (1.3.1)
* Restore protobuf-2.x compatibility.
* Use xenial and protobuf 3.6.1 in the Travis-CI environment.
* Convert uses of protobuf's scoped_ptr.h to C++11 std::unique_ptr, needed
  to compile against protobuf 3.6.1.
* Use AX_CXX_COMPILE_STDCXX macro to enable C++11 support in old compilers
* Add std:: to some types.
* Check the return value of int_range_lookup before using as an array index;
  it can return -1.
* Fix compilation on mingw by using explicit protoc --plugin=NAME=PATH syntax
  in Makefile.am