[PATCH 11/12] configure: bump min required GCC to 6.3.0

["Daniel P. Berrangé" <berrange@redhat.com>]

Several distros have been dropped since the last time we bumped the
minimum required GCC version.

Per repology, currently shipping versions are:

             RHEL-8: 8.3.1
     Debian Stretch: 6.3.0
      Debian Buster: 8.3.0
 openSUSE Leap 15.2: 7.5.0
   Ubuntu LTS 18.04: 7.5.0
   Ubuntu LTS 20.04: 9.3.0
            FreeBSD: 10.3.0
          Fedora 33: 9.2.0
          Fedora 34: 11.0.1
            OpenBSD: 8.4.0
     macOS HomeBrew: 11.1.0

With this list Debian Stretch is the constraint at 6.3.0

Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
---
 configure | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/configure b/configure
index a1a40577c9..43d2470bb6 100755
--- a/configure
+++ b/configure
@@ -2059,8 +2059,8 @@ cat > $TMPC << EOF
 #  endif
 # endif
 #elif defined(__GNUC__) && defined(__GNUC_MINOR__)
-# if __GNUC__ < 4 || (__GNUC__ == 4 && __GNUC_MINOR__ < 8)
-#  error You need at least GCC v4.8 to compile QEMU
+# if __GNUC__ < 6 || (__GNUC__ == 6 && __GNUC_MINOR__ < 3)
+#  error You need at least GCC v6.3.0 to compile QEMU
 # endif
 #else
 # error You either need GCC or Clang to compiler QEMU
@@ -2068,7 +2068,7 @@ cat > $TMPC << EOF
 int main (void) { return 0; }
 EOF
 if ! compile_prog "" "" ; then
-    error_exit "You need at least GCC v4.8 or Clang v3.4 (or XCode Clang v5.1)"
+    error_exit "You need at least GCC v6.3 or Clang v3.4 (or XCode Clang v5.1)"
 fi
 
 # Accumulate -Wfoo and -Wno-bar separately.
-- 
2.31.1