[jit][ocl] Debug and build kernel improved

[jjfumero]

Description

Build log for OpenCL fixed.

Problem description

There was an issue when the OpenCL build was not correct, the log string was not printed.

Backend/s tested

Mark the backends affected by this PR.

• [X] OpenCL
• [ ] PTX
• [ ] SPIRV

OS tested

Mark the OS where this PR is tested.

• [X] Linux
• [ ] OSx
• [ ] Windows

Did you check on FPGAs?

If it is applicable, check your changes on FPGAs.

• [ ] Yes
• [X] No

How to test the new patch?

make 
make tests

[stratika]

is there any other way to test this PR? For example, what is the new output that is printed?

[jjfumero]

You can try to compile something unsupported in Java.

[jjfumero]

All comments addressed.