r235638 is not the clean way to add support for building on ancient FreeBSD

versions.  Instead use Imp's good work on "legacy" and follow the outcome
of the previous TRB discussions on this topic.

Now use the libc getline() if it exists, and only where it doesn't
create a bootstraping version.

lib/libmagic/Makefile

@@ -39,9 +39,9 @@ magic.mgc: mkmagic magic
 
 CLEANFILES+=	mkmagic
 build-tools: mkmagic
-mkmagic: apprentice.c encoding.c funcs.c getline.c magic.c print.c
-	${CC} ${CFLAGS} -DCOMPILE_ONLY -DHOSTPROG ${LDFLAGS} \
-	    -o ${.TARGET} ${.ALLSRC}
+mkmagic: apprentice.c encoding.c funcs.c magic.c print.c
+	${CC} ${CFLAGS} -DCOMPILE_ONLY ${LDFLAGS} -o ${.TARGET} ${.ALLSRC} \
+	    ${LDADD}
 
 FILEVER!= awk '$$1 == "\#define" && $$2 == "VERSION" { print $$3; exit }' \
 			${.CURDIR}/config.h

lib/libmagic/config.h

@@ -39,9 +39,7 @@
 #define HAVE_FSEEKO 1
 
 /* Define to 1 if you have the `getline' function. */
-#ifndef HOSTPROG
 #define HAVE_GETLINE 1
-#endif
 
 /* Define to 1 if you have the <getopt.h> header file. */
 #define HAVE_GETOPT_H 1

tools/build/Makefile

@@ -3,12 +3,24 @@
 .PATH: ${.CURDIR}/../../include
 
 LIB=		egacy
-SRCS=
+SRC=
 INCSGROUPS=	INCS
-INCS=		
+INCS=
 
 BOOTSTRAPPING?=	0
 
+_WITH_GETLINE!=	grep -c _WITH_GETLINE /usr/include/stdio.h || true
+.if ${_WITH_GETLINE} == 0
+.PATH: ${.CURDIR}/../../contrib/file ${.CURDIR}/../../lib/libmagic
+SRCS=		getline.c config.h
+CFLAGS+=	-DHAVE_CONFIG_H -I.
+CLEANFILES+=	config.h
+
+${SRCS:N*.h:R:S/$/.o/}: config.h
+config.h: ${.CURDIR}/../../lib/libmagic/config.h
+	grep -v HAVE_GETLINE ${.ALLSRC} > ${.TARGET}
+.endif
+
 .if empty(SRCS)
 SRCS=		dummy.c
 .endif