x86,vdso: Restore a bunch of section headers

This series makes me sad. It brings the 64-bit vdso back above 4kB, like it was in 3.15. It's also just silly, but it seems to be needed to keep binutils happy when debugging the vdso.

Patch 5 isn't really necessary, and is likely not 3.16 material. It's useful for testing the rest of this series, though.

Only patch 5 changed from v1:
- Fix for old binutils.
- Pass --build-id, since normal binutils may not have it on by default.

Andy Lutomirski (5):
x86,vdso: Discard the __bug_table section x86,vdso2c: Use better macros for ELF bitness x86,vdso: Improve the fake section headers x86,vdso: Remove some redundant in-memory section headers x86,vdso: Create .build-id links for unstripped vdso files

 arch/x86/vdso/Makefile                   |  20 +++-
 arch/x86/vdso/vdso-fakesections.c        |  41 +++----
 arch/x86/vdso/vdso-layout.lds.S          |  64 +++++++---
 arch/x86/vdso/vdso.lds.S                 |   2 +
 arch/x86/vdso/vdso2c.c                   |  73 ++++++------
 arch/x86/vdso/vdso2c.h                   | 197 ++++++++++++++++++++++++++-----
 arch/x86/vdso/vdso32/vdso-fakesections.c |   1 +
 arch/x86/vdso/vdsox32.lds.S              |   2 +
 8 files changed, 284 insertions(+), 116 deletions(-)
 create mode 100644 arch/x86/vdso/vdso32/vdso-fakesections.c

1.9.3