Use __WORDSIZE instead of BFD_HOST_64BIT_LONG

to verify the conformity of architecture.

This resolves FTBFS with binutils >= 2.39 on amd64.

Signed-off-by: Slávek Banko <slavek.banko@axis.cz>
(cherry picked from commit 7671e68390)

src/libr-bfd.h

@@ -7,11 +7,12 @@
 #include <stdint.h>
 #include <bfd.h>
 
-#if BFD_HOST_64BIT_LONG
+#if (__WORDSIZE == 64)
 	#if defined(__i386)
 		#error "Using incorrect binutils header file for architecture."
 	#endif
-#else
+#endif
+#if (__WORDSIZE == 32)
 	#if defined(__amd64)
 		#error "Using incorrect binutils header file for architecture."
 	#endif