When "getopt()" is not available, various of the netcdf-c utilities
use XGetopt instead. This occurs primarily when building under Window,
so the build changes are restricted to CMake.
This PR tries to isolate XGetopt.c to the libdispatch directory
and then builds the various utilities using this cliche:
````
IF(USE_X_GETOPT)
SET(XGETOPTSRC "${CMAKE_CURRENT_SOURCE_DIR}/../libdispatch/XGetopt.c")
ENDIF()
````
This avoids the need to copy XGetopt.c to all the directories that
use it.
re: Issue https://github.com/Unidata/netcdf-c/issues/2656
Charlie Zender notes that *nc_open()* does not immediately detect that the given path refers to a file not in zarr format. Rather it fails later when trying to read the (meta-)data.
The reason is that the Zarr format is highly decentralized. There is no easily testable magic number or superblock to look for. In effect the only way to see if a directory is Zarr is to successfully read it.
It is possible to heuristically detect that a path refers to an NCZarr/Zarr file by doing a breadth-first search of the file tree starting at the given path. If the search encounters a file whose name starts with ".z", then assume it is a legitimate NCZarr/Zarr file. Of course, this test could be costly. One hopes that in practice that it is not.
In addition to this fix, a corresponding test case was added.
## Other Changes
re: PR https://github.com/Unidata/netcdf-c/pull/2529
There was an error under Cygwin for this PR that is fixed in this PR. The fix was to convert all *noinst_* references to *check_*.
re: Issue
The byterange handling of the following URLS fails.
### Problem 1: "https://crudata.uea.ac.uk/cru/data/temperature/HadCRUT.4.6.0.0.median.nc#mode=bytes"
It turns out that byterange in hdf5 has two possible targets: S3 and not-S3 (e.g. a thredds server or the crudata URL above). Each uses a different HDF5 Virtual File Driver (VFD).
I incorrectly set up the byterange code in libhdf5 so that it would choose one or the other of the two VFD's for any netcdf-c library build. The fix is to allow it to choose either one at run-time.
### Problem 2: "https://noaa-goes16.s3.amazonaws.com/ABI-L1b-RadF/2022/001/18/OR_ABI-L1b-RadF-M6C01_G16_s20220011800205_e20220011809513_c20220011809562.nc#mode=bytes,s3"
When given what appears to be an S3-related URL, the netcdf-c library code converts it into a canonical, so-called "path" format. In casing out the possible input URL formats, I missed the case where the host contains the bucket ("noaa-goes16"), but not the region. So the fix was to check for this case.
## Misc. Related Changes
1. Since S3 is used in more than just NCZarr, I changed the automake/cmake options to replace "--enable-nczarr-s3" with "--enable-s3", but keeping the former option as a synonym for the latter. This also entailed cleaning up libnetcdf.settings WRT S3 support
2. Added the above URLS as additional test cases
## Misc. Un-Related Changes
1. CURLOPT_PUT is deprecated in favor to CURLOPT_UPLOAD
2. Fix some minor warnings
## Open Problems
* Under Ubuntu, either libcrypto or aws-sdk-cpp has a memory leak.
