Pullup ticket #3179 - requested by tnn

Pullup ticket #3179 - requested by tnn
mail/thunderbird: security update and build fix

Revisions pulled up:
- mail/thunderbird/Makefile			patch
- mail/thunderbird/distinfo			patch
- mail/thunderbird/patches/patch-directory_c-sdk_configure.in	new file
- mail/thunderbird/patches/patch-directory_c-sdk_ldap_include_portable.h	new file
- mail/thunderbird/patches/patch-directory_c-sdk_ldap_libraries_libldap_Makefile.in	new file
- mail/thunderbird/patches/patch-mp		patch
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Fix the following security vulnerabilities:

MFSA 2010-47 Cross-origin data leakage from script filename in error messages
MFSA 2010-46 Cross-domain data theft using CSS
MFSA 2010-42 Cross-origin data disclosure via Web Workers and importScripts
MFSA 2010-41 Remote code execution using malformed PNG image
MFSA 2010-40 nsTreeSelection dangling pointer remote code execution
MFSA 2010-39 nsCSSValue::Array index integer overflow
MFSA 2010-34 Miscellaneous memory safety hazards (rv:1.9.2.7/ 1.9.1.11)