Fix a build error on FreeBSD 12, bison 3.3.2, automake 1.16.1 and BSD make

by dropping the rules to run bison and use automake's built-in rules instead

src/frontend/Makefile.am

@@ -4,6 +4,8 @@ SUBDIRS = plotting help parser wdisp numparam trannoise
 DIST_SUBDIRS = plotting help parser wdisp numparam trannoise
 EXTRA_DIST = testcommands.c
 
+BUILT_SOURCES = parse-bison.h
+
 noinst_LTLIBRARIES = libfte.la
 
 libfte_la_SOURCES =	\
@@ -150,7 +152,6 @@ libfte_la_SOURCES =	\
 	parse.c		\
 	parse.h		\
 	parse-bison.y	\
-	parse-bison-y.h	\
 	points.c	\
 	points.h	\
 	postcoms.c	\
@@ -198,8 +199,3 @@ AM_CFLAGS = $(STATIC)
 AM_YFLAGS = -d
 
 MAINTAINERCLEANFILES = Makefile.in
-
-$(srcdir)/parse.c : parse-bison.c
-
-parse-bison.c : parse-bison.y
-	$(am__skipyacc) $(YACCCOMPILE) -o $@ $<

src/spicelib/parser/Makefile.am

@@ -2,6 +2,8 @@
 
 noinst_LTLIBRARIES = libinp.la
 
+BUILT_SOURCES = inpptree-parser.h
+
 libinp_la_SOURCES = \
 		ifeval.c	\
 		ifnewuid.c	\
@@ -60,18 +62,12 @@ libinp_la_SOURCES = \
 		inppname.c	\
 		inpptree.c	\
 		inpptree-parser.y \
-		inpptree-parser-y.h \
 		inpsymt.c	\
 		inptyplk.c	\
 		ptfuncs.c	\
 		sperror.c	\
 		inpxx.h
 
-$(srcdir)/inpptree.c : inpptree-parser.c
-
-inpptree-parser.c : inpptree-parser.y
-	$(am__skipyacc) $(YACCCOMPILE) -o $@ $<
-
 AM_CPPFLAGS = @AM_CPPFLAGS@ -I$(top_srcdir)/src/include -I$(top_srcdir)/src/frontend
 AM_CFLAGS = $(STATIC)
 AM_YFLAGS = -d