module check irssi version

Add explicit checks into every module to match the ABI version defined
in common.h

src/perl/perl-core.c

@@ -466,3 +466,8 @@ void perl_core_deinit(void)
 	signal_remove("script error", (SIGNAL_FUNC) sig_script_error);
 	PERL_SYS_TERM();
 }
+
+void perl_core_abicheck(int *version)
+{
+	*version = IRSSI_ABI_VERSION;
+}

src/perl/perl-fe.c

@@ -278,3 +278,8 @@ void fe_perl_deinit(void)
 
         perl_core_print_script_error(TRUE);
 }
+
+void fe_perl_abicheck(int *version)
+{
+	*version = IRSSI_ABI_VERSION;
+}