Fix sorting in MachO::Binary::extend_section, rework extend_section tests #1152
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If there are empty sections and non-empty section at the same offset, we want to shift only empty sections. The expected behavior is that we sort sections in ascending order, and then `sections_to_shift` is trimmed, such that the last element becomes `section`. Previously, we were sorting in descending order, while keeping empty sections in the same order. Due to this we were doing trimming incorrectly.
The previous implementation of the test was expecting unsupported behavior from LIEF. LIEF currently does not support arbitrary calls to add_section and extend_section and keeping the layout of the binary correct. Currently it is responsibility of a user to ensure that the final layout of the binary is well-formed. This patch splits test into two cases: 1. Repeated calls to add_section followed by extend_section using different alignment values. 2. Multiple calls to add_section and then multiple calls to extend_section using the same alignment values.
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