[i386] Rename __cdecl to __asmcall

__cdecl is a misleading name, since it currently encapsulates both
cdecl and regparm(0) attributes.  Rename to __asmcall.

src/include/compiler.h

@@ -302,9 +302,6 @@ int __debug_disable;
 /** Declare a variable or data structure as unused. */
 #define __unused __attribute__ (( unused ))
 
-/** Apply standard C calling conventions */
-#define __cdecl __attribute__ (( cdecl , regparm(0) ))
-
 /**
  * Declare a function as pure - i.e. without side effects
  */
@@ -372,4 +369,6 @@ int __debug_disable;
 
 #endif /* ASSEMBLY */
 
+#include <bits/compiler.h>
+
 #endif /* COMPILER_H */