[llvm-objcopy] Apply encryptable offset to first segment, not section (#130517) Bug introduced #120995. The LLD code calculates the "size" of the Mach-O headers, and then uses that size to place the segments, but the `__TEXT` section stays at `fileoff` zero. When I wrote the code into llvm-objcopy I calculated the extra space into the initial offset, which moved all the sections back 1 page. Besides the modified test checking for the right `fileoff` values of the sections and the segments, I also manually checked the generated binaries after `llvm-objcopy` using `dyld_info`, as the bug report suggested. Fixes #130472
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