qemu-config: Use QEMU instead of Qemu

This new 'Qemu' was recently added.
Replace it by the official all upper case 'QEMU'.

Signed-off-by: Stefan Weil <sw@weilnetz.de>
Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>

qemu-config.h

@@ -19,7 +19,7 @@ int qemu_config_parse(FILE *fp, QemuOptsList **lists, const char *fname);
 
 int qemu_read_config_file(const char *filename);
 
-/* Read default Qemu config files
+/* Read default QEMU config files
  */
 int qemu_read_default_config_files(bool userconfig);