Removed deny_severity,allow_severity defs from filan.c and procan.c to make gcc version 10 happy

CHANGES

@@ -12,6 +12,14 @@ Corrections:
 	quotes
 	Test: UNBALANCED_QUOTE
 
+Porting:
+	In gcc version 10 the default changed from -fcommon to -fno-common.
+	Consequently, linking filan and procan failed with error
+	"multiple definition of `deny_severity'" and `allow_severity'
+	Fixed by removing definitions in filan.c and procan.c
+	Debian issue 957823
+	Thanks to László Böszörményi and others for reporting this issue.
+
 Testing:
 	test.sh now produces a list of tests that could not be performed for
 	any reason. This helps to analyse these cases.

filan.c

@@ -28,10 +28,6 @@ struct sockopt {
 
 static int filan_streams_analyze(int fd, FILE *outfile);
 
-/* dirty workaround so we dont get an error on AIX when being linked with
-   libwrap */
-int allow_severity, deny_severity;
-
 /* global variables for configuring filan */
 bool filan_followsymlinks;
 bool filan_rawoutput;

procan.c

@@ -19,10 +19,6 @@
 
 #include "procan.h"
 
-/* dirty workaround so we dont get an error on AIX when getting linked with
-   libwrap */
-int allow_severity, deny_severity;
-
 
 int procan(FILE *outfile) {