test failures on ppc64le and s390x

[davide125]

When building on ppc64le the tests fail with:

./tester
Invalid glTF binary.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
tester is a Catch v1.12.2 host application.
Run with -? for options
-------------------------------------------------------------------------------
datauri-in-glb
-------------------------------------------------------------------------------
tester.cc:40
...............................................................................
tester.cc:52: FAILED:
  REQUIRE( true == ret )
with expansion:
  true == false
-------------------------------------------------------------------------------
empty-bin-buffer
-------------------------------------------------------------------------------
tester.cc:564
...............................................................................
tester.cc:580: FAILED:
  REQUIRE( true == ret )
with expansion:
  true == false
Invalid glTF binary.
File size 1800 exceeds maximum allowed file size 10 : ../models/Cube/Cube.bin
WARN:File not found : �AAAQAAA5
Failed to load external 'uri' for image[0] name = "�AAAQAAA5"
Invalid glTF binary.-------------------------------------------------------------------------------
zero-sized-bin-chunk-glb
-------------------------------------------------------------------------------
tester.cc:906
...............................................................................
tester.cc:927: FAILED:
  REQUIRE( true == ret )
with expansion:
  true == false
===============================================================================
test cases:  30 |  27 passed | 3 failed
assertions: 198 | 195 passed | 3 failed

When building on s390x the tests fail with:

./tester
Invalid glTF binary.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
tester is a Catch v1.12.2 host application.
Run with -? for options
-------------------------------------------------------------------------------
empty-bin-buffer
-------------------------------------------------------------------------------
tester.cc:564
...............................................................................
tester.cc:580: FAILED:
  REQUIRE( true == ret )
with expansion:
  true == false
WARN:File not found : �AAAQAAA5
Failed to load external 'uri' for image[0] name = "�AAAQAAA5"
File size 1800 exceeds maximum allowed file size 10 : ../models/Cube/Cube.bin
===============================================================================
test cases:  30 |  29 passed | 1 failed
assertions: 198 | 197 passed | 1 failed

You can see the full build logs at https://koji.fedoraproject.org/koji/taskinfo?taskID=116389786

[syoyo]

Probably you'll need to add little endian for PPC and big endian detection support for s390x

tinygltf/tiny_gltf.h

Line 1784 in cde43ef

#if defined(__sparcv9) || defined(__powerpc__)

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