Portable StaticAssertExpr

Use a different way to write StaticAssertExpr() that does not require
the GCC extension statement expressions.

For C, we put the static_assert into a struct.  This appears to be a
common approach.

We still need to keep the fallback implementation to support buggy
MSVC < 19.33.

For C++, we put it into a lambda expression.  (The C approach doesn't
work; it's not permitted to define a new type inside sizeof.)

Reviewed-by: Jelte Fennema-Nio <[email protected]>
Discussion: 
https://www.postgresql.org/message-id/flat/5fa3a9f5-eb9a-4408-9baf-403d281f8b10%40eisentraut.org

Branch
------
master

Details
-------
https://git.postgresql.org/pg/commitdiff/aa7c86852343dd18f5834f70e4caa50ae49326c9

Modified Files
--------------
config/c-compiler.m4       | 16 ----------------
configure                  | 31 -------------------------------
configure.ac               |  1 -
meson.build                | 13 -------------
src/include/c.h            | 30 ++++++++++++++++++++++--------
src/include/pg_config.h.in |  3 ---
6 files changed, 22 insertions(+), 72 deletions(-)

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