elftoolchain: Use ${SRCTOP} for the top of the FreeBSD tree

[emaste]

As suggested in https://lists.freebsd.org/pipermail/svn-src-all/2016-April/121906.html

lib/libdwarf/Makefile

5

Also renamed TOP to ELFTCDIR as used elsewhere in ELF Tool Chain build bits to avoid confusion.

[ngie]

lib/libdwarf/Makefile

5

I think this is missing a tab.

lib/libelf/Makefile

8

I think this is missing a tab.

83

Isn't . implied?

[emaste]

lib/libdwarf/Makefile

5

Unfortunately ELFTCDIR is too long and it looks odd with a tab after, unless SRCDIR below gets indented an extra tab, and then PACKAGE= looks out of place:

PACKAGE=lib${LIB}
ELFTCDIR=       ${SRCTOP}/contrib/elftoolchain
SRCDIR=         ${ELFTCDIR}/libdwarf

lib/libelf/Makefile

83

It's needed for < > includes relative to ..

[bdrewery]

+1