Don't ignore sprintf/sscanf imports, semantics are not exactly the
same on Windows.

diff --git a/tools/winebuild/import.c b/tools/winebuild/import.c
index ea4d291..08bfb24 100644
--- a/tools/winebuild/import.c
+++ b/tools/winebuild/import.c
@@ -100,9 +100,7 @@
     "qsort",
     "sin",
     "sinh",
-    "sprintf",
     "sqrt",
-    "sscanf",
     "strcat",
     "strchr",
     "strcmp",
@@ -117,8 +115,7 @@
     "strspn",
     "strstr",
     "tan",
-    "tanh",
-    "vsprintf"
+    "tanh"
 };
 
 /* compare function names; helper for resolve_imports */