fix problems found in testing

src/vxworks/aarch64.rs

 pub type c_char = u8;
+pub type wchar_t = u32;
 pub type c_long = i64;
 pub type c_ulong = u64;

src/vxworks/arm.rs

 pub type c_char = u8;
+pub type wchar_t = u32;
 pub type c_long = i32;
 pub type c_ulong = u32;

src/vxworks/armv7.rs

-pub type c_long = i32;
-pub type c_ulong = u32;

src/vxworks/powerpc.rs

 pub type c_char = u8;
+pub type wchar_t = u32;
 pub type c_long = i32;
 pub type c_ulong = u32;

src/vxworks/powerpc64.rs

 pub type c_char = u8;
+pub type wchar_t = u32;
 pub type c_long = i64;
 pub type c_ulong = u64;

src/vxworks/x86.rs

 pub type c_char = i8;
+pub type wchar_t = i32;
 pub type c_long = i32;
 pub type c_ulong = u32;

src/vxworks/x86_64.rs

+pub type c_char = i8;
+pub type wchar_t = i32;
 pub type c_long = i64;
 pub type c_ulong = u64;
-pub type c_char = i8;