Makefile.am: fix libglobal.la races

Several targets had libglobal.la in the  _LDFLAGS macro definition
when it should have been in the _LDADD macro.  Remove those occurrance
and add the LIBGLOBAL_LDA macro to the targets _LDADD instead.

See related commit 71f3e56d4b2c07f5fc56522a2080f1ff101ef340

Signed-off-by: Gary Lowell  <gary.lowell@inktank.com>
Reviewed-by: Dan Mick <dan.mick@inktank.com>