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Update LD_LIBRARY_PATH when the prefix is executable and PATH is updated

Pablo Marcos Oltra requested to merge pamarcos/cerbero:update_ld_library_path_when_prefix_is_executable into master

Cross compiling for Linux x86 inside x86_64 the prefix is executable and the PATH is updated with bindir (/build/dist/linux_x86/bin), but LD_LIBRARY_PATH is not updated with libdir (/build/dist/linux_x86/lib). Same logic to add to PATH should be done to add to LD_LIBRARY_PATH.

Error fixed:

./cerbero-uninstalled -t -c cross-linux-x86.cbc build freetype
...
0:05:11.642423 -----> Extracting tarball to /build/sources/linux_x86/freetype-2.9
bzip2: error while loading shared libraries: libbz2.so.1: cannot open shared object file: No such file or directory
tar: Child returned status 127
tar: Error is not recoverable: exiting now
...

Inside the shell

ldd /build/dist/linux_x86/bin/bzip2
    linux-gate.so.1 =>  (0xf7f17000)
    libbz2.so.1 => not found
    libc.so.6 => /lib/i386-linux-gnu/libc.so.6 (0xf7d49000)
    /lib/ld-linux.so.2 (0xf7f18000)

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