Correctly finish up MFC of r310840:

Move llvm-objdump from CLANG_EXTRAS to installed by default

The SUBDIR entry was not actually moved to the right location in
usr.bin/clang/Makefile.

usr.bin/clang/Makefile

@@ -7,6 +7,7 @@ SUBDIR+=	clang-tblgen
 SUBDIR+=	llvm-tblgen
 
 .if !defined(TOOLS_PREFIX)
+SUBDIR+=	llvm-objdump
 SUBDIR+=	llvm-symbolizer
 
 .if ${MK_CLANG_EXTRAS} != "no"
@@ -31,7 +32,6 @@ SUBDIR+=	llvm-mca
 SUBDIR+=	llvm-modextract
 SUBDIR+=	llvm-nm
 SUBDIR+=	llvm-objcopy
-SUBDIR+=	llvm-objdump
 SUBDIR+=	llvm-pdbutil
 SUBDIR+=	llvm-rtdyld
 SUBDIR+=	llvm-xray