[BUILD] update MacOS Makefile to build on newer versions
This update from Dan Zinngrabe enables building on MacOS 10.4 and 10.5.
diff --git a/Makefile.osx b/Makefile.osx
index f2469bc..c6b03c6 100644
--- a/Makefile.osx
+++ b/Makefile.osx
@@ -92,8 +92,8 @@
COPTS = -Iinclude $(ADDINC) $(CPU_OPTS) $(TARGET_OPTS) $(REGEX_OPTS) \
$(SMALL_OPTS) $(VER_OPTS) $(DEFINE)
LIBS = $(LIBS.$(TARGET)) $(LIBS.$(REGEX)) $(ADDLIB)
-CFLAGS = -Wall $(COPTS) $(DEBUG) -isysroot /Developer/SDKs/MacOSX10.4u.sdk -arch ppc -arch i386
-LDFLAGS = -g -isysroot /Developer/SDKs/MacOSX10.4u.sdk -arch ppc -arch i386
+CFLAGS = -Wall $(COPTS) $(DEBUG) -isysroot /Developer/SDKs/MacOSX10.4u.sdk -arch ppc -arch i386 -mmacosx-version-min=10.4
+LDFLAGS = -g -isysroot /Developer/SDKs/MacOSX10.4u.sdk -arch ppc -arch i386 -mmacosx-version-min=10.4
OBJS = src/haproxy.o src/sessionhash.o src/base64.o src/protocols.o \
src/uri_auth.o src/standard.o src/buffers.o src/log.o src/task.o \