msvcp90: Avoid compiler warnings on recent versions of gcc (4.9.1).

[Sebastian Lackner]

gcc 4.9.1 complains in these lines because of the ignored return value.

---
 dlls/msvcp90/ios.c    |  4 ++--
 dlls/msvcp90/locale.c |  6 +++---
 dlls/msvcp90/string.c | 12 ++++++------
 3 files changed, 11 insertions(+), 11 deletions(-)
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