Move the debug variable from main.c to individual fuzzer

The fuzzers needs to be completely independent of the main.c for
OSS-Fuzz to work.

fuzz/dns_name_fromtext_target.c

@@ -20,6 +20,8 @@
 
 #include "fuzz.h"
 
+bool debug = false;
+
 static isc_mem_t *mctx = NULL;
 
 int

fuzz/dns_rdata_fromwire_text.c

@@ -28,6 +28,8 @@
 
 #include "fuzz.h"
 
+bool debug = false;
+
 /*
  * Fuzz input to dns_rdata_fromwire(). Then convert the result
  * to text, back to wire format, to multiline text, and back to wire

fuzz/isc_lex_getmastertoken.c

@@ -20,6 +20,8 @@
 
 #include "fuzz.h"
 
+bool debug = false;
+
 int
 LLVMFuzzerInitialize(int *argc __attribute__((unused)),
 		     char ***argv __attribute__((unused)));

fuzz/isc_lex_gettoken.c

@@ -19,6 +19,8 @@
 
 #include "fuzz.h"
 
+bool debug = false;
+
 static isc_mem_t *mctx = NULL;
 static isc_lex_t *lex = NULL;
 

fuzz/main.c

@@ -24,8 +24,6 @@
 
 #include <dirent.h>
 
-bool debug = false;
-
 static void
 test_all_from(const char *dirname) {
 	DIR *dirp;