component/nodejs: prevent configure from using system python

configure is a python script that autodetects the python interpreter
and may use a system python, execute the script with software release's
python directly.

component/nodejs/buildout.cfg

@@ -74,19 +74,21 @@ openssl_location = ${openssl:location}
 version = v12.18.3
 md5sum = 28bf6a4d98b238403fa58a0805f4a979
 PATH = ${pkgconfig:location}/bin:${python2.7:location}/bin:%(PATH)s
+configure-command = ./configure
 
 [nodejs-8.9.4]
 <= nodejs-base
 version = v8.9.4
 md5sum = 4ddc1daff327d7e6f63da57fdfc24f55
 PATH = ${pkgconfig:location}/bin:${python2.7:location}/bin:%(PATH)s
-
+configure-command = ./configure
 
 [nodejs-8.12.0]
 <= nodejs-base
 version = v8.12.0
 md5sum = 5690333b77964edf81945fc724f6ea85
 PATH = ${pkgconfig:location}/bin:${python2.7:location}/bin:%(PATH)s
+configure-command = ./configure
 
 [nodejs-base]
 # Server-side Javascript.
@@ -97,11 +99,13 @@ openssl_location = ${openssl-1.0:location}
 recipe = slapos.recipe.cmmi
 shared = true
 url = https://nodejs.org/dist/${:version}/node-${:version}.tar.gz
+configure-command = python3 configure
 configure-options =
+  --prefix=%(location)s
   --shared-openssl
   --shared-openssl-includes=${:openssl_location}/include
   --shared-openssl-libpath=${:openssl_location}/lib
-PATH = ${pkgconfig:location}/bin:%(PATH)s
+PATH = ${python3:location}/bin:${pkgconfig:location}/bin:%(PATH)s
 environment =
   HOME=@@LOCATION@@
   PATH=${:PATH}