Fixed bug #43514 SMTP authentication disabled when only LOGIN is enabled
added VS2010 projects / cahanged solutions to VS2010
httpd_structs.h: IAR 7 wants 'static const' instead of 'const static'...
httpd.h: added C++ guards
Win32 pcapif.c: fix C coding style, include lwipcfg_msvc.h as first file so that it can set _CRT_SECURE_NO_WARNINGS for MSVC
httpd: fixed compiling HTTPD_USE_MEM_POOL in strict C (not C++)
Merge branch 'master' of git://git.savannah.nongnu.org/lwip/lwip-contrib