os.h: change elif _WIN32 to elif defined(_WIN32)
authorsezero <sezero@users.sourceforge.net>
Sun, 23 Jul 2017 08:27:00 +0000 (11:27 +0300)
committerRalph Giles <giles@thaumas.net>
Mon, 24 Jul 2017 23:36:12 +0000 (16:36 -0700)
commite3230ddc86f7164db1e310b7e7275e90a3556e3b
treead884279a1ca7f497ec3088aeb0f3fcb824f2474
parented677ec711e9a95ae06365d076325232a3bc19a6
os.h: change elif _WIN32 to elif defined(_WIN32)

This symbol is only defined (with the value 1) when building
for the Windows target, so we need to ifdef, not if.

Signed-off-by: Ralph Giles <giles@thaumas.net>
lib/os.h