Fix Odin_OS_Type

vendor/botan/bindings/botan.odin

@@ -140,11 +140,11 @@ totp_t               :: ^totp_struct
 fpe_struct           :: struct{}
 fpe_t                :: ^fpe_struct
 
-when ODIN_OS == "windows" {
+when ODIN_OS == .Windows {
     foreign import botan_lib "botan.lib"
-} else when ODIN_OS == "linux" {
+} else when ODIN_OS == .Linux {
     foreign import botan_lib "system:botan-2"
-} else when ODIN_OS == "darwin" {
+} else when ODIN_OS == .Darwin {
     foreign import botan_lib "system:botan-2"
 }
 
@@ -471,4 +471,4 @@ foreign botan_lib {
     fpe_destroy                         :: proc(fpe: fpe_t) -> c.int ---
     fpe_encrypt                         :: proc(fpe: fpe_t, x: mp_t, tweak: ^c.char, tweak_len: c.size_t) -> c.int ---
     fpe_decrypt                         :: proc(fpe: fpe_t, x: mp_t, tweak: ^c.char, tweak_len: c.size_t) -> c.int ---
-}
+}