Fix compile error on GCC 10 (Fedora 32)

FreedomBen · mptre · commit 160d7bed4531 · 2020-04-27T09:01:02.000+02:00
GCC 10 complains about the unused variable called "unused" Adding `extern` to the declarations fixes the error. Fixes #301
diff --git a/compat-pledge.c b/compat-pledge.c
@@ -1,6 +1,6 @@
 #include "config.h"
 
-int unused;
+extern int unused;
 
 #ifndef HAVE_PLEDGE
 
diff --git a/compat-reallocarray.c b/compat-reallocarray.c
@@ -1,6 +1,6 @@
 #include "config.h"
 
-int unused;
+extern int unused;
 
 #ifndef HAVE_REALLOCARRAY
 
diff --git a/compat-strtonum.c b/compat-strtonum.c
@@ -1,6 +1,6 @@
 #include "config.h"
 
-int unused;
+extern int unused;
 
 #ifndef HAVE_STRTONUM
 
