pptpd: import from old packages

Signed-off-by: Luka Perkov <luka@openwrt.org>

net/pptpd/patches/003-opt_flags.patch

@@ -0,0 +1,11 @@
+--- a/Makefile.in
++++ b/Makefile.in
+@@ -153,7 +153,7 @@ AUTOMAKE = @AUTOMAKE@
+ AWK = @AWK@
+ CC = @CC@
+ CCDEPMODE = @CCDEPMODE@
+-CFLAGS = -O2 -fno-builtin -Wall -DSBINDIR='"$(sbindir)"'
++CFLAGS = $(COPTS) -fno-builtin -Wall -DSBINDIR='"$(sbindir)"'
+ CPP = @CPP@
+ CPPFLAGS = @CPPFLAGS@
+ CYGPATH_W = @CYGPATH_W@