windows/uselect: Enable micropython select in dev variant.

ports/windows/msvc/sources.props

@@ -14,6 +14,7 @@
     <PyExtModSource Include="$(PyBaseDir)extmod\modujson.c" />
     <PyExtModSource Include="$(PyBaseDir)extmod\modurandom.c" />
     <PyExtModSource Include="$(PyBaseDir)extmod\modure.c" />
+    <PyExtModSource Include="$(PyBaseDir)extmod\moduselect.c" />
     <PyExtModSource Include="$(PyBaseDir)extmod\modutimeq.c" />
     <PyExtModSource Include="$(PyBaseDir)extmod\moduzlib.c" />
     <PyExtModSource Include="$(PyBaseDir)extmod\utime_mphal.c" />

ports/windows/variants/dev/mpconfigvariant.h

@@ -36,3 +36,4 @@
 #define MICROPY_COMP_CONST                      (0)
 #define MICROPY_PY_URANDOM_EXTRA_FUNCS          (1)
 #define MICROPY_PY_BUILTINS_SLICE_INDICES       (1)
+#define MICROPY_PY_USELECT                      (1)