Add support for ARM64 and musl and fix few mistakes#3

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vladmovchan wants to merge 18 commits intoPercona-Lab:masterfrom

vladmovchan:upstream-fixes-and-improvements

Commits on Apr 26, 2021

Address different header files location in case of musl
Vladyslav Movchan
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Define data types which are missing in musl
Vladyslav Movchan
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There is no __getpagesize() in musl, but existing getpagesize() should
Vladyslav Movchan
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There is no bits/wordsize.h header in musl
Vladyslav Movchan
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Include linux/time.h for musl where timespec data type is defined
Vladyslav Movchan
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Skip stat64 and fstat64 if they are macros and not functions
Vladyslav Movchan
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Make it possible for non-amd64 platforms to pass coredumper_unittest
Vladyslav Movchan
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Import the recent version of linux_syscall_support.h from
Vladyslav Movchan
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Adapt according to changed sys_prctl() definition
Vladyslav Movchan
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Restore sys__sigprocmask wrapper used in linux_syscall_support_unittest
Vladyslav Movchan
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Add missing aarch64 bits
Vladyslav Movchan
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Add aarch64 support
Vladyslav Movchan
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Correct waitpid wstatus argument type
Vladyslav Movchan
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Add missing header for getpid()
Vladyslav Movchan
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PT_LOAD segment might not always go first
Vladyslav Movchan
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Interpret p_vaddr as an offset rather than absolute address
Vladyslav Movchan
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Correct check for proper alignment
Vladyslav Movchan
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Skip PT_NOTE segment obtained from vDSO
Vladyslav Movchan
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