Enable compiling Emacs with implicit Make rules suppressed

* lib/Makefile.in (.SUFFIXES):

* lwlib/Makefile.in (.SUFFIXES):

* oldXMenu/Makefile.in (.SUFFIXES):

* src/Makefile.in (.SUFFIXES): Register .c as a default suffix,
for this list is emptied when `-r' is provided to Make.

lib/Makefile.in

@@ -98,6 +98,7 @@ libegnu_a_OBJECTS = $(patsubst %.o,e-%.o,$(for_emacs_OBJECTS))
 
 $(libegnu_a_OBJECTS) $(libgnu_a_OBJECTS): $(BUILT_SOURCES)
 
+.SUFFIXES: .c
 .c.o:
 	$(AM_V_CC)$(CC) -c $(CPPFLAGS) $(ALL_CFLAGS) -o $@ $<
 e-%.o: %.c

lwlib/Makefile.in

@@ -81,6 +81,7 @@ ALL_CFLAGS= $(C_SWITCH_SYSTEM) $(C_SWITCH_X_SITE) \
   -Demacs -I../src \
   -I$(srcdir) -I$(srcdir)/../src -I../lib -I$(srcdir)/../lib
 
+.SUFFIXES: .c
 .c.o:
 	$(AM_V_CC)$(CC) -c $(CPPFLAGS) $(ALL_CFLAGS) $<
 

oldXMenu/Makefile.in

@@ -112,6 +112,7 @@ ALL_CFLAGS=$(C_SWITCH_SYSTEM) $(C_SWITCH_MACHINE) \
   $(CPPFLAGS) $(CFLAGS) -DEMACS_BITMAP_FILES \
   -I../src -I../lib -I${srcdir} -I${srcdir}/../src -I${srcdir}/../lib
 
+.SUFFIXES: .c
 .c.o:
 	$(AM_V_CC)$(CC) -c ${ALL_CFLAGS} $<
 

src/Makefile.in

@@ -452,7 +452,7 @@ ALL_OBJC_CFLAGS = $(EMACS_CFLAGS) \
 ALL_CXX_CFLAGS = $(EMACS_CFLAGS) \
   $(filter-out $(NON_CXX_CFLAGS),$(WARN_CFLAGS)) $(CXXFLAGS)
 
-.SUFFIXES: .m .cc
+.SUFFIXES: .c .m .cc
 .c.o:
 	$(AM_V_CC)$(CC) -c $(CPPFLAGS) $(ALL_CFLAGS) $(PROFILING_CFLAGS) $<
 .m.o: