For Linux, use the Linux / Glibc based defines instead of included headers

This is to ensure compatibility with the OS you are compiling against and that
headers are maintained in upstream projects.

- Moved PPP_EAP and PPP_ECP into respective header files in lieu of not currently
  existing in the linux/ppp_defs.h

- Unchained the top-level ${topsrc_dir}/include, this folder is included for
  prosterity and may continue to exist on github, but in the future eliminated from
  distribution

- Bogus upstream file in glibc for <net/if_ppp.h>, its content should be replaced
  with a simple include to <linux/ppp-ioctl.h>. The lack of an appropriate ifreq
  structure with ppp_stats or ppp_comp_stats, implementet that inline (and tested).

- Updated instances where PPP_FCS() macro would expand the fcstab, while PPP_GOODFCS
  and PPP_INITFCS is provided in <linux/ppp_defs.h>, the latter is tied to a lookup
  table. It's used in two places, so add the PPP_FCS macro where applicable.

Signed-off-by: Eivind Næss <eivnaes@yahoo.com>

1 files changed, 6 insertions, 0 deletions

diff --git a/pppd/eap.h b/pppd/eap.h
index fbc7201..96c5f69 100644
--- a/pppd/eap.h
+++ b/pppd/eap.h
@@ -29,6 +29,12 @@
 extern "C" {
 #endif
 
+
+#ifndef PPP_EAP
+#define PPP_EAP 0xc227
+#endif
+
+
 /*
  * Packet header = Code, id, length.
  */