cmake build fixes (#770)

* Fix nanopb (in cmake build)

Look for binaries in the src dir (since that's where we build now.) This
error would be masked if a previous build had completed prior to
switching nanopb to build out of src.

Also, don't patch the protoc path multiple times. This could be
triggered by (eg) 'make && make clean && make'.

* Add resource_path.{h,cc} to the cmake build

* Fix signed/unsigned int comparison warnings

* Ensure FieldValue tag_ is initialized during cp/mv ctor.

Otherwise, the assignment operator attempts to deallocate based on the
(uninitialized) tag_ variable, posssibly leading to segfaults.

* Fix tests that throw exceptions.

The (previous) tests checked to ensure that an abort() occurs, but if
ABSL_HAVE_EXCEPTIONS is defined on non-macos (which is currently the
default) then the assertions will throw a std::logic_error rather than
abort()ing.

On macos, an exception is thrown too, but the exception doesn't derrive
from std::exception, so ASSERT_DEATH_* doesn't catch it (hence why
ASSERT_DEATH_* actually works.)

To resolve this, I've switched to ASSERT_ANY_THROW.

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