Boinc-Client: Fix nettle error

component/boinc-client/buildout.cfg

@@ -14,6 +14,7 @@ extends =
   ../pkgconfig/buildout.cfg
   ../openldap/buildout.cfg
   ../gnutls/buildout.cfg
+  ../nettle/buildout.cfg
   ../../stack/slapos.cfg
 
 [download-boinc]
@@ -89,6 +90,6 @@ environment =
   PKG_CONFIG_PATH=${openssl:location}/lib/pkgconfig
   M4=${m4:location}/bin/m4
   CFLAGS=-fPIC
-  CPPFLAGS=-I${openssl:location}/include -I${zlib:location}/include
-  LDFLAGS = -L${openssl:location}/lib -Wl,-rpath=${openssl:location}/lib -L${zlib:location}/lib -Wl,-rpath=${zlib:location}/lib
+  CPPFLAGS=-I${openssl:location}/include -I${zlib:location}/include -I${nettle:location}/include
+  LDFLAGS = -L${openssl:location}/lib -Wl,-rpath=${openssl:location}/lib -L${zlib:location}/lib -Wl,-rpath=${zlib:location}/lib -L${nettle:location}/lib -Wl,-rpath=${nettle:location}/lib
   ACLOCAL_PATH=${pkgconfig:location}/share/aclocal:${libtool:location}/share/aclocal