src: use correct flags for compiling .c files, fix missing dependencies

fiewalk and fiemap depend on a lot of crucible, and incremental builds
fail hard without proper dependency tracking.

All binaries must be rebuilt when makeflags changes.  This dependency
exists already in lib and test, but src was missing.

Signed-off-by: Zygo Blaxell <bees@furryterror.org>

src/Makefile

@@ -3,6 +3,8 @@ PROGRAMS = \
 	../bin/fiemap \
 	../bin/fiewalk \
 
+PROGRAM_OBJS = $(foreach b,$(PROGRAMS),$(patsubst ../bin/%,%.o,$(b)))
+
 all: $(BEES) $(PROGRAMS)
 
 include ../makeflags
@@ -19,6 +21,8 @@ BEES_OBJS = \
 	bees-thread.o \
 	bees-types.o \
 
+ALL_OBJS = $(BEES_OBJS) $(PROGRAM_OBJS)
+
 bees-version.c: bees.h $(BEES_OBJS:.o=.cc) Makefile
 	echo "const char *BEES_VERSION = \"$(BEES_VERSION)\";" > bees-version.new.c
 	mv -f bees-version.new.c bees-version.c
@@ -33,13 +37,16 @@ bees-usage.c: bees-usage.txt Makefile
 .depends/%.dep: %.cc Makefile | .depends
 	$(CXX) $(BEES_CXXFLAGS) -M -MF $@ -MT $(<:.cc=.o) $<
 
-depends.mk: $(BEES_OBJS:%.o=.depends/%.dep)
+depends.mk: $(ALL_OBJS:%.o=.depends/%.dep)
 	cat $^ > $@.new
 	mv -f $@.new $@
 
 include depends.mk
 
-$(BEES_OBJS) fiemap.o fiewalk.o: %.o: %.cc
+%.o: %.c ../makeflags
+	$(CC) $(BEES_CFLAGS) -o $@ -c $<
+
+%.o: %.cc ../makeflags
 	$(CXX) $(BEES_CXXFLAGS) -o $@ -c $<
 
 $(PROGRAMS): ../bin/%: %.o