_align_XXX functions aren't widely available depending on the C runtime. That causes
problems with mingw where we can easily have some runtime mixes (which lead to mysterious
segfaults most of the time). This patch introduce winpr_aligned_XXX functions that will
either use the function available, or use an emulation layer.
Since these functions were called from 2 different threads
(main thread or dynamic channel) depending on fastpath or
gfx channel use lock between these.
If not locked the invalid region may be accessed from both
threads and lead to crashes as experienced with nightly df280a7ff
