configure: Probe for __popcnt()/__popcnt64()
commit20ad6deb7bbdd258fad1e1e3eee7e9f16d887f39
authorOlly Betts <olly@survex.com>
Sat, 21 Oct 2017 11:28:23 +0000 (22 00:28 +1300)
committerOlly Betts <olly@survex.com>
Sun, 22 Oct 2017 03:43:36 +0000 (22 16:43 +1300)
tree3694ec3116ad596f0855b6580a29831878461fa4
parentcd82671b74f813e3ea9dbb92cd7a498ef5e7c5ea
configure: Probe for __popcnt()/__popcnt64()

MSVC provides these, but they need <intrin.h> to be included, and
__popcnt64() isn't available for x86.
xapian-core/backends/glass/glass_freelist.cc
xapian-core/configure.ac