[Pacth] BZ#18181 - Libabigail master branch fails to compile on EPEL 6

[Sinny Kumari]

Hi,

This patch is for bug https://sourceware.org/bugzilla/show_bug.cgi?id=18181 .

Libabigail compilation was failing on EPEL6  because of undefined use of macros 
 EM_AARCH64, EM_TILEPRO and EM_TILEGX. 

This patch (attached with this email) adds checks whether above above macros 
are defined or not. If not defined,  switch cases calling these macros are 
excluded.

I have used 3 separate call of AC_CHECK_DECL() for checking defined behavior of 
each macros individually instead of calling AC_CHECK_DECLS() and defining a 
single macro for checking defined behavior of all macros together. This is 
because, macros  EM_TILEPRO and EM_TILEGX were added in glibc 2.16 and 
EM_AARCH64 was added in glibc 2.17 release.

Thanks
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