fxdll.h: revert koolsmoky commit bab2f1c 'use dllimport for __MSC__ imports'

it was wrong, and was causing LNK4049 warnings.

swlibs/fxmisc/3dfx.h

@@ -66,7 +66,7 @@ typedef struct { float r, g, b, a; } FxColor4;
 #    define FX_ENTRY 
 #    define FX_CALL
 #  else
-#    define FX_ENTRY __declspec( dllimport )
+#    define FX_ENTRY extern
 #    define FX_CALL  __stdcall
 #  endif
 #elif defined(__WATCOMC__)

swlibs/fxmisc/fxdll.h

@@ -37,19 +37,15 @@
    may have changed, so we do not protect this with an #fndef __FXDLL_H__
    statement like we normally would. */
 
-
 #ifdef FX_ENTRY
 #undef FX_ENTRY
 #endif
-
 #ifdef FX_CALL
 #undef FX_CALL
 #endif
-
 #ifdef FX_EXPORT
 #undef FX_EXPORT
 #endif
-
 #ifdef FX_CSTYLE
 #undef FX_CSTYLE
 #endif
@@ -87,13 +83,8 @@
   #endif /* FX_DLL_ENABLE */
 
 #else /* FX_DLL_DEFINITION */
-  #if defined(__MSC__)
-    #define FX_ENTRY __declspec( dllimport )
-    #define FX_CALL __stdcall
-  #else
   #define FX_ENTRY extern
   #define FX_CALL __stdcall
-  #endif
 #endif /* FX_DLL_DEFINITION */
 
 /*