[llvm-objcopy] - Report "no zlib available" error properly when --compress-debug-sections is used.
[llvm-objcopy] - Report "no zlib available" error properly when --compress-debug-sections is used.

If zlib is not available, and --compress-debug-sections is passed, 
we want to report an error. Currently, it is only reported for
--compress_debug_sections= form of the option.

Fixes the https://bugs.llvm.org/show_bug.cgi?id=40886.

I do not think there is a way to write a test for this.

Differential revision: https://reviews.llvm.org/D58909

git-svn-id: 0ff597fd157e6f4fc38580e8d64ab130330d2411@355391 91177308-0d34-0410-b5e6-96231b3b80d8

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