Do not enforce all includes to be as plain C because it can lead to FTBFS.

Signed-off-by: Slávek Banko <slavek.banko@axis.cz>
(cherry picked from commit 233f500687)

keximdb/src/mdbtools/include/mdbtools.h

@@ -19,9 +19,6 @@
 #ifndef _mdbtools_h_
 #define _mdbtools_h_
 
-#ifdef __cplusplus
-  extern "C" {
-#endif
 #include <stdio.h>
 #include <stdlib.h>
 #include <stdarg.h>
@@ -38,6 +35,10 @@
 #include <iconv.h>
 #endif
 
+#ifdef __cplusplus
+  extern "C" {
+#endif
+
 #define MDB_DEBUG 0
 
 #define MDB_PGSIZE 4096