fixup! shellinabox: fix environment. version up to v2.18.

envirionment+= seems not working here.

component/shellinabox/buildout.cfg

@@ -14,16 +14,9 @@ parts = shellinabox
 [shellinabox]
 <= shellinabox-2.10
 
-[shellinabox-common]
-recipe = slapos.recipe.cmmi
-environment =
-    CFLAGS = -I${zlib:location}/include -I${openssl:location}/include
-    LDFLAGS = -L${zlib:location}/lib -Wl,-rpath=${zlib:location}/lib -L${openssl:location}/lib -Wl,-rpath=${openssl:location}/lib
-    PKG_CONFIG_PATH = ${openssl:location}/lib/pkgconfig/
-
 [shellinabox-2.10]
 ; This version is old, but we patch it for IPv6 support
-<= shellinabox-common
+recipe = slapos.recipe.cmmi
 url = http://shellinabox.googlecode.com/files/shellinabox-2.10.tar.gz
 md5sum = 0e144910d85d92edc54702ab9c46f032
 patch-binary = ${patch:location}/bin/patch
@@ -31,6 +24,10 @@ patch-options = -p1
 patches =
     ${:_profile_base_location_}/0001-Switch-to-IPv6.patch#b61cb099c00e15a5fcaf6c98134fff45
     ${:_profile_base_location_}/0002-Allow-to-run-entire-command-path.patch#a506b4d83021e24c830f767501c1d3fc
+environment =
+    CFLAGS = -I${zlib:location}/include -I${openssl:location}/include
+    LDFLAGS = -L${zlib:location}/lib -Wl,-rpath=${zlib:location}/lib -L${openssl:location}/lib -Wl,-rpath=${openssl:location}/lib
+    PKG_CONFIG_PATH = ${openssl:location}/lib/pkgconfig/
 
 [shellinabox-git-repository]
 ; This version has much more features, but does not support IPv6 (support unix domain though)
@@ -40,11 +37,14 @@ revision = b8285748993c4c99e80793775f3d2a0a4e962d5a
 git-executable = ${git:location}/bin/git
 
 [shellinabox-github]
-<= shellinabox-common
+recipe = slapos.recipe.cmmi
 path = ${shellinabox-git-repository:location}
 configure-command =
   ${libtool:location}/bin/libtoolize
   ${autoconf:location}/bin/autoreconf -vif
   ./configure
-environment +=
+environment =
   PATH=${autoconf:location}/bin:${automake:location}/bin:${libtool:location}/bin:${m4:location}/bin:%(PATH)s
+  CFLAGS = -I${zlib:location}/include -I${openssl:location}/include
+  LDFLAGS = -L${zlib:location}/lib -Wl,-rpath=${zlib:location}/lib -L${openssl:location}/lib -Wl,-rpath=${openssl:location}/lib
+  PKG_CONFIG_PATH = ${openssl:location}/lib/pkgconfig/