MFstable/11 r304951:

MFstable/11 r304951:

MFC r303804:

Fix building usr.bin/tar/tests with PIE symbol building enabled by
removing CFLAGS+= -static

`CFLAGS+= -static` was a carryover from pre-r289195 with
usr.bin/tar/test/Makefile that should have been specified in LDFLAGS
There doesn't seem to be an apparent need for static compilation
of the test binaries.

Obtained-from:	opBSD (418a491eed20d2603ddd1f1bd92c2c0d95094002)

git-svn-id: svn://svn.freebsd.org/base/stable/10@305275 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f