perl plugin: Restore missing include of "collectd.h"

Restore include which was removed in fa36b45bfafec663e49639d40f4671e018e7ee10 (#2769).
This adressed to solve compilation issue on Solaris platform.

diff --git a/src/perl.c b/src/perl.c
index 31c68ad..fffbc21 100644 (file)
--- a/src/perl.c
+++ b/src/perl.c
@@ -33,6 +33,7 @@
 /* do not automatically get the thread specific Perl interpreter */
 #define PERL_NO_GET_CONTEXT
 
+#include "collectd.h"
 #include <stdbool.h>
 
 #include <EXTERN.h>