python-serial: fix shebang

Add the --executable shebang fixup option to the build phase so that the
script ends with a proper #!/usr/bin/python interpeter line set.

Signed-off-by: Gustavo Zacarias <gustavo@zacarias.com.ar>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>

package/python-serial/python-serial.mk

@@ -6,12 +6,12 @@
 
 PYTHON_SERIAL_VERSION = 2.6
 PYTHON_SERIAL_SOURCE  = pyserial-$(PYTHON_SERIAL_VERSION).tar.gz
-PYTHON_SERIAL_SITE    = http://pypi.python.org/packages/source/p/pyserial/
+PYTHON_SERIAL_SITE    = http://pypi.python.org/packages/source/p/pyserial
 
 PYTHON_SERIAL_DEPENDENCIES = python
 
 define PYTHON_SERIAL_BUILD_CMDS
-	(cd $(@D); $(HOST_DIR)/usr/bin/python setup.py build)
+	(cd $(@D); $(HOST_DIR)/usr/bin/python setup.py build --executable=/usr/bin/python)
 endef
 
 define PYTHON_SERIAL_INSTALL_TARGET_CMDS