Add a configure check for zlib (Ryota OZAKI).

This patch makes configure check zlib devel files installed.
Current configure doesn't check that, so make will fail if they
are not installed.
Signed-off-by: NRyota Ozaki <ozaki.ryota@gmail.com>


git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@5456 c046a42c-6fe2-441c-8c8c-71466251a162

configure

@@ -715,6 +715,23 @@ else
    nptl="no"
 fi
 
+##########################################
+# zlib check
+
+cat > $TMPC << EOF
+#include <zlib.h>
+int main(void) { zlibVersion(); return 0; }
+EOF
+if $cc $CFLAGS $LDFLAGS -o $TMPE $TMPC -lz 2> /dev/null ; then
+    :
+else
+    echo
+    echo "Error: zlib check failed"
+    echo "Make sure to have the zlib libs and headers installed."
+    echo
+    exit 1
+fi
+
 ##########################################
 # SDL probe