examples: Fix compilation under OS X

examples/Makefile

 PREFIX ?= /usr/local
 WARN = -Wall -Wextra -Wno-unused-parameter -Wno-sign-compare
-CPPFLAGS = -I.
+CPPFLAGS = -I. -I.. -I../..
 CFLAGS := $(WARN) -O2 -g $(CFLAGS)
-LDFLAGS := -lrt $(LDFLAGS)
 OBJ = dvb_print_si dvb_gen_si dvb_ecmg dvb_ecmg_test mpeg_print_pcr rtp_check_seqnum mpeg_restamp
 
+ifeq "$(shell uname -s)" "Linux"
+LDFLAGS += -lrt
+endif
+
 ifeq "$(shell uname -s)" "Darwin"
-LDLIBS += -liconv
-# Prevent generation of .dSYM debug directories
-CFLAGS += -gstabs
+LDFLAGS += -liconv
 endif
 
 all: $(OBJ)
@@ -21,4 +22,4 @@ install: $(OBJ)
 	install -m 755 $(OBJ) "$(DESTDIR)$(PREFIX)/bin"
 
 clean:
-	$(RM) $(OBJ)
+	$(RM) -rf $(OBJ) *.dSYM