[Rd] 'make install' fails on Solaris (PR#13946)

[bownes at gmail.com]

Full_Name: Bob Bownes
Version: 2.9.2
OS: Solaris 10
Submission from: (NULL) (164.55.254.106)


The sed lines in src/unix/Makefile confuse the grep distributed with Solaris
that gets configured by ./configure. 

Switching from a separator of ':' to a separator of ',' fixes the problem.

76,77c76,77
<       @$(SED) -e "s:@rhome:$(rhome):" -e "s:@rincludedir:$(rincludedir):" \
<         -e 's:@libsprivate:$(STATIC_LIBR_PC):' \
---
>       @$(SED) -e "s, at rhome,$(rhome)," -e "s, at rincludedir,$(rincludedir)," \
>         -e 's, at libsprivate,$(STATIC_LIBR_PC),' \