Add extern "C" guard blocks to SDK header files

[dannybackx]

Hi,

This appears to be missing from sntp.h and also the other include files.

Danny

acer: {541} diff -c sntp.h~ sntp.h
*** sntp.h~     2015-11-24 09:50:33.000000000 +0100
--- sntp.h      2016-01-02 15:45:41.976664979 +0100
***************
*** 7,12 ****
--- 7,17 ----
  #else
  #include "ip_addr.h"
  #endif
+ 
+ #if defined(__cplusplus)
+ extern "C" {
+ #endif
+ 
  /**
   * get the seconds since Jan 01, 1970, 00:00 (GMT + 8)
   */
***************
*** 66,68 ****
--- 71,77 ----
  #define sntp_servermode_dhcp(x)
  
  #endif
+ 
+ #if defined(__cplusplus)
+ }
+ #endif
acer: {542} 

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[igrr]

Since we are modifying some of the SDK headers anyway, it might make sense to add cpp guard blocks to all of them.

[devyte]

@igrr exactly which SDK files should get the guards? Should I just add the guards to the files, or should there be some patch made to apply to newer versions in the future? I seem to remember you mentioning that you keep a set of patches somewhere...