Force external asn1_compile and compile_et binaries.
At the moment the samba bundled heimdal fails to build the tools for the host
when cross-compiling, and it can't link to an external heimdal either.

Status: working with samba upstream on a proper way to cross-compile
the bundled heimdal.

Signed-off-by: Gustavo Zacarias <gustavo@zacarias.com.ar>

diff -Nura samba-4.1.3.orig/source4/heimdal_build/wscript_build samba-4.1.3.heimdal.cross/source4/heimdal_build/wscript_build
--- samba-4.1.3.orig/source4/heimdal_build/wscript_build	2013-12-12 16:45:46.951965484 -0300
+++ samba-4.1.3.heimdal.cross/source4/heimdal_build/wscript_build	2013-12-18 22:01:24.323429945 -0300
@@ -925,6 +925,8 @@
         install=False
     )
     bld.env['ASN1_COMPILE'] = os.path.join(bld.env['BUILD_DIRECTORY'], 'asn1_compile')
+else:
+    bld.env['ASN1_COMPILE'] = 'asn1_compile'
 
 
 if not bld.CONFIG_SET('USING_SYSTEM_COMPILE_ET'):
@@ -939,6 +941,8 @@
         install=False
         )
     bld.env['COMPILE_ET'] = os.path.join(bld.env['BUILD_DIRECTORY'], 'compile_et')
+else:
+    bld.env['COMPILE_ET'] = 'compile_et'
 
 HEIMDAL_BINARY('samba4kinit',
     'kuser/kinit.c',
diff -Nura samba-4.1.3.orig/source4/heimdal_build/wscript_configure samba-4.1.3.heimdal.cross/source4/heimdal_build/wscript_configure
--- samba-4.1.3.orig/source4/heimdal_build/wscript_configure	2013-12-12 16:45:46.951965484 -0300
+++ samba-4.1.3.heimdal.cross/source4/heimdal_build/wscript_configure	2013-12-18 21:55:08.813653187 -0300
@@ -162,6 +162,8 @@
 conf.define('HAVE_KRB5_PRINCIPAL_GET_NUM_COMP', 1)
 conf.define('HAVE_GSSAPI_GSSAPI_SPNEGO_H', 1)
 conf.define('HAVE_FLAGS_IN_KRB5_CREDS', 1)
+conf.define('USING_SYSTEM_ASN1_COMPILE', 1)
+conf.define('USING_SYSTEM_COMPILE_ET', 1)
 
 heimdal_includedirs = []
 heimdal_libdirs = []