Doesn't build without, perhaps a typo?

--- devil-1.7.8/src-IL/include/il_internal.h	2017-10-16 16:22:00.900140671 +0200
+++ devil-1.7.8/src-IL/include/internal.h	2017-10-16 16:22:32.174749685 +0200
@@ -227,7 +227,7 @@
 ILboolean ilLoadBlp(ILconst_string FileName);
 ILboolean ilLoadBlpF(ILHANDLE File);
 ILboolean ilLoadBlpL(const void *Lump, ILuint Size);
-ILboolean ilIsValidBmp(ILconst_string CONST_RESTRICT FileName);
+ILboolean ilIsValidBmp(ILconst_string FileName);
 ILboolean ilIsValidBmpF(ILHANDLE File);
 ILboolean ilIsValidBmpL(const void *Lump, ILuint Size);
 ILboolean ilLoadBmp(ILconst_string FileName);