Rename usr.bin/elfcopy to usr.bin/objcopy

We always install ELF Tool Chain's elfcopy as objcopy, so to avoid
confusion rename the src directory containing our reach-over Makefile
to match.

Requested by:	jhb
Sponsored by:	The FreeBSD Foundation

Makefile.inc1

@@ -2182,7 +2182,7 @@ _binutils=	gnu/usr.bin/binutils
 .if ${MK_ELFTOOLCHAIN_BOOTSTRAP} != "no"
 _elftctools=	lib/libelftc \
 		lib/libpe \
-		usr.bin/elfcopy \
+		usr.bin/objcopy \
 		usr.bin/nm \
 		usr.bin/size \
 		usr.bin/strings
@@ -2195,7 +2195,7 @@ _elftctools+=	usr.bin/addr2line
 # the target (for at least crunchide).
 _elftctools=	lib/libelftc \
 		lib/libpe \
-		usr.bin/elfcopy
+		usr.bin/objcopy
 .endif
 
 .if ${MK_CLANG_BOOTSTRAP} != "no"
@@ -2280,7 +2280,7 @@ NXBDIRS+= \
     usr.bin/cmp \
     usr.bin/diff \
     usr.bin/dirname \
-    usr.bin/elfcopy \
+    usr.bin/objcopy \
     usr.bin/env \
     usr.bin/fetch \
     usr.bin/find \

usr.bin/Makefile

@@ -264,7 +264,7 @@ SUBDIR.${MK_TOOLCHAIN}+=	c89
 SUBDIR.${MK_TOOLCHAIN}+=	c99
 SUBDIR.${MK_TOOLCHAIN}+=	ctags
 SUBDIR.${MK_TOOLCHAIN}+=	cxxfilt
-SUBDIR.${MK_TOOLCHAIN}+=	elfcopy
+SUBDIR.${MK_TOOLCHAIN}+=	objcopy
 SUBDIR.${MK_TOOLCHAIN}+=	file2c
 # ARM64TODO gprof does not build
 # RISCVTODO gprof does not build