Workaround https://github.com/waf-project/waf/issues/1515 since pycairo

bundled a much older version of waf without that fix, so waf assumes

python*-config is a python script and barfs on our shell script version.

--- pycairo-1.10.0/.waf3-1.6.4-e3c1e08604b18a10567cfcd2d02eb6e6/waflib/Tools/python.py

+++ pycairo-1.10.0/.waf3-1.6.4-e3c1e08604b18a10567cfcd2d02eb6e6/waflib/Tools/python.py

@@ -169,7 +169,7 @@

conf.find_program('python-config-%s'%num,var='PYTHON_CONFIG',mandatory=False)

includes=[]

if conf.env.PYTHON_CONFIG:

- for incstr in conf.cmd_and_log(conf.env.PYTHON+[conf.env.PYTHON_CONFIG,'--includes']).strip().split():

+ for incstr in conf.cmd_and_log([conf.env.PYTHON_CONFIG,'--includes']).strip().split():

if(incstr.startswith('-I')or incstr.startswith('/I')):

incstr=incstr[2:]

if incstr not in includes: