Remove all backend/port/${PORTNAME} references from template files, since

they don't exist anymore

src/template/i386_solaris-cc

 AROPT:cq
-CFLAGS:-I$(SRCDIR)/backend/port/sparc_solaris
+CFLAGS:
 SHARED_LIB:-K PIC
 ALL:
 SRCH_INC:

src/template/i386_solaris-gcc

 AROPT:crs
-CFLAGS:-I$(SRCDIR)/backend/port/sparc_solaris
+CFLAGS:
 SHARED_LIB:-fPIC
 ALL:
 SRCH_INC:

src/template/sco

 AROPT:cq
-CFLAGS:-I$(SRCDIR)/backend/port/sco
+CFLAGS:
 SHARED_LIB:-K PIC
 ALL:
 SRCH_INC:

src/template/sparc_solaris-cc

 AROPT:crs
-CFLAGS:-I$(SRCDIR)/backend/port/sparc_solaris -Xa -v
+CFLAGS:-Xa -v
 SHARED_LIB:-K PIC
 ALL:
 SRCH_INC:

src/template/sparc_solaris-gcc

 AROPT:crs
-CFLAGS:-I$(SRCDIR)/backend/port/sparc_solaris
+CFLAGS:
 SHARED_LIB:-fPIC
 ALL:
 SRCH_INC:

src/template/svr4

 AROPT:crs
-CFLAGS:-I$(SRCDIR)/backend/port/svr4
+CFLAGS:
 SHARED_LIB:
 ALL:+W0
 SRCH_INC: