Improve dependency gathering logic (#7345)

This unfies the rocm/cuda dependency logic into the makefile
and fixes a missing define which broke windows rocm

llama/make/common-defs.make

@@ -57,12 +57,18 @@ ifeq ($(OS),windows)
 	EXE_EXT := .exe
 	SHARED_PREFIX := 
 	CPU_FLAG_PREFIX := /arch:
+ifneq ($(HIP_PATH),)
+	# If HIP_PATH has spaces, hipcc trips over them when subprocessing
+	HIP_PATH := $(shell cygpath -m -s "$(patsubst %\,%,$(HIP_PATH))")
+	export HIP_PATH
+endif
 else ifeq ($(OS),linux)
 	CP := cp -af
 	OBJ_EXT := o
 	SHARED_EXT := so
 	SHARED_PREFIX := lib
 	CPU_FLAG_PREFIX := -m
+	HIP_PATH?=/opt/rocm
 else
 	OBJ_EXT := o
 	SHARED_EXT := so