Disable extended alignment uses on older g++

Fix for commit a9bdb63bba8.  The previous plan of redefining alignas
didn't work, because it interfered with other C++ header files (e.g.,
LLVM).  So now the new workaround is to just disable the affected
typedefs under the affected compilers.  These are not typically used
in extensions anyway.

Discussion: 
https://www.postgresql.org/message-id/3119480.1769189606%40sss.pgh.pa.us

Branch
------
master

Details
-------
https://git.postgresql.org/pg/commitdiff/6ceef9408c26b6e188ec88c4303e9bad8ce33bff

Modified Files
--------------
src/include/c.h | 20 ++++++++++----------
1 file changed, 10 insertions(+), 10 deletions(-)

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