gcc6 hack

http://lists.pld-linux.org/mailman/pipermail/pld-devel-en/2017-June/025365.html
https://patchwork.openembedded.org/patch/122245/

 ---

gcc6 has fixed a long standing c++ include issue where <cheader>
was different from <header.h> inclusion via

https://gcc.gnu.org/ml/libstdc++/2016-01/msg00025.html

and its also descibed in https://gcc.gnu.org/gcc-6/porting_to.html
rpmio component uses some .cpp and .cc fies which need to use
C stdlib.h from C library and not the C++ libstdc++ header
therefore we pass _GLIBCXX_INCLUDE_NEXT_C_HEADERS so that it
keeps the old behavior
--- rpm-5.4.15/rpmio/rpmjni.cc~	2014-08-09 01:08:50.000000000 +0300
+++ rpm-5.4.15/rpmio/rpmjni.cc	2017-06-25 16:42:23.383464974 +0300
@@ -1,3 +1,4 @@
+#define _GLIBCXX_INCLUDE_NEXT_C_HEADERS
 #include "system.h"
 #include <rpmlog.h>
 #include <rpmmacro.h>
--- rpm-5.4.15/rpmqv.cc~	2017-06-25 17:37:53.000000000 +0300
+++ rpm-5.4.15/rpmqv.cc	2017-06-25 18:01:37.158939691 +0300
@@ -1,3 +1,4 @@
+#define _GLIBCXX_INCLUDE_NEXT_C_HEADERS
 #include "system.h"
 extern const char *__progname;