[PATCH for 7.2] Fix broken configure with -Wunused-parameter

[Stefan Weil]

The configure script fails because it tries to compile small C programs
with a main function which is declared with arguments argc and argv
although those arguments are unused.

Running `configure -extra-cflags=-Wunused-parameter` triggers the problem.
configure for a native build does abort but shows the error in config.log.
A cross build configure for Windows with Debian stable aborts with an
error.

Avoiding unused arguments fixes this.

Signed-off-by: Stefan Weil <sw@weilnetz.de>
---

See https://gitlab.com/qemu-project/qemu/-/issues/1295.

I noticed the problem because I often compile with -Wextra.

Stefan

 configure | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/configure b/configure
index 4275f5419f..1106c04fea 100755
--- a/configure
+++ b/configure
@@ -1258,6 +1258,7 @@ if test "$stack_protector" != "no"; then
   cat > $TMPC << EOF
 int main(int argc, char *argv[])
 {
+    (void)argc;
     char arr[64], *p = arr, *c = argv[0];
     while (*c) {
         *p++ = *c++;
@@ -1607,7 +1608,7 @@ fi
 
 if test "$safe_stack" = "yes"; then
 cat > $TMPC << EOF
-int main(int argc, char *argv[])
+int main(void)
 {
 #if ! __has_feature(safe_stack)
 #error SafeStack Disabled
@@ -1629,7 +1630,7 @@ EOF
   fi
 else
 cat > $TMPC << EOF
-int main(int argc, char *argv[])
+int main(void)
 {
 #if defined(__has_feature)
 #if __has_feature(safe_stack)
@@ -1675,7 +1676,7 @@ static const int Z = 1;
 #define TAUT(X) ((X) == Z)
 #define PAREN(X, Y) (X == Y)
 #define ID(X) (X)
-int main(int argc, char *argv[])
+int main(void)
 {
     int x = 0, y = 0;
     x = ID(x);
-- 
2.30.2