Switch windows build to fully dynamic

Refactor where we store build outputs, and support a fully dynamic loading
model on windows so the base executable has no special dependencies thus
doesn't require a special PATH.

gpu/types.go

@@ -2,7 +2,6 @@ package gpu
 
 // Beginning of an `ollama info` command
 type GpuInfo struct {
-	Driver      string `json:"driver,omitempty"`
 	Library     string `json:"library,omitempty"`
 	TotalMemory uint64 `json:"total_memory,omitempty"`
 	FreeMemory  uint64 `json:"free_memory,omitempty"`