meson: generate qemu-version.h

Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

scripts/qemu-version.sh

@@ -0,0 +1,25 @@
+#!/bin/sh
+
+set -eu
+
+dir="$1"
+pkgversion="$2"
+version="$3"
+
+if [ -z "$pkgversion"]; then
+    cd "$dir"
+    if [ -e .git ]; then
+        pkgversion=$(git describe --match 'v*' --dirty | echo "")
+    fi
+fi
+
+if [ -n "$pkgversion" ]; then
+    fullversion="$version ($pkgversion)"
+else
+    fullversion="$version"
+fi
+
+cat <<EOF
+#define QEMU_PKGVERSION "$pkgversion"
+#define QEMU_FULL_VERSION "$fullversion"
+EOF