fix(raykx): use absolute path for def file on Windows

Use cygpath to convert to Windows-style absolute path, avoiding
MSYS2 path conversion issues with /DEF: argument.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: singaraiona

ext/raykx/Makefile

@@ -12,13 +12,12 @@ CFLAGS = -Wall -Wextra -std=c17 -fsigned-char -m64 -I. -I../../core
 
 ifneq (,$(IS_WINDOWS))
     TARGET = raykx.dll
-    # On Windows, link against rayforce.lib import library and export functions via .def
-    # lld requires TEMP for temp files, but make doesn't pass env vars by default
-    # MSYS2_ARG_CONV_EXCL prevents path conversion for /DEF: argument
+    # On Windows, link against rayforce.lib import library
+    # Use absolute path for .def file to avoid MSYS2 path conversion issues
     TEMP ?= /tmp
     export TEMP
-    export MSYS2_ARG_CONV_EXCL = /DEF:
-    LDFLAGS = -shared -fuse-ld=lld -Wl,/DEF:raykx.def
+    DEF_PATH := $(shell cygpath -m $(CURDIR)/raykx.def)
+    LDFLAGS = -shared -fuse-ld=lld -Wl,/DEF:$(DEF_PATH)
     LIBS = -lws2_32 -lmswsock ../../rayforce.lib
     DEBUG_CFLAGS = $(CFLAGS) -g -O0 -DDEBUG -D_CRT_SECURE_NO_WARNINGS
     RELEASE_CFLAGS = $(CFLAGS) -O3 -D_CRT_SECURE_NO_WARNINGS