mingw: fix delivery of gcc libs

Change-Id: I03c55ceb685b4de580bfc3125792e7a75e133821
mingw: fix use of jawt

Change-Id: I47b4a1f5ca5b8ce3cde11d4db599d6afb54a2886
specify linking opts for jawt centrally

Change-Id: Idb8d97d44b16bbe41372d97c46199ec786c38218
mixing build path and host exec. name doesn't work

Change-Id: I54785205e3884ddf7b94ef7f43617bd329c4e780