Fix xnnpack.h casing in CMakeLists.txt
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 2d961a6..69eacde 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -930,7 +930,7 @@
 
 TARGET_INCLUDE_DIRECTORIES(XNNPACK PUBLIC include)
 TARGET_INCLUDE_DIRECTORIES(XNNPACK PRIVATE src)
-SET_TARGET_PROPERTIES(XNNPACK PROPERTIES PUBLIC_HEADER include/XNNPACK.h)
+SET_TARGET_PROPERTIES(XNNPACK PROPERTIES PUBLIC_HEADER include/xnnpack.h)
 
 # ---[ Configure clog
 IF(NOT TARGET clog)