Introduced in #436.

This should also be updated for the autoconf / automake build environment. Right now, the `libde265.pc` file for these builds will contain `@LIBS_PRIVATE@`.

_Originally posted by @fancycode in https://github.com/strukturag/libde265/issues/436#issuecomment-1865819964_
            
Fix private libraries in libde265.pc for autoconf / automake build
This is a GitHub Issue
repo:libde265
owner:strukturag
Title : Fix private libraries in libde265.pc for autoconf / automake build
Issue date:

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Introduced in #436.

This should also be updated for the autoconf / automake build environment. Right now, the `libde265.pc` file for these builds will contain `@LIBS_PRIVATE@`.

_Originally posted by @fancycode in https://github.com/strukturag/libde265/issues/436#issuecomment-1865819964_
            
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