make-release: Include libmicrohttpd-10.dll if it exists
httpsrv: Some older versions of libmicrohttpd need stdint.h included first
cpu: sse2_64: Rename sha256_init to sha256_init_sse2 to avoid conflict with new sha2.c
Merge branch 'httpsrv' into bfgminer
Merge branch 'cg_merges_20130822a' into bfgminer