Fix CMake build by adding missing intrinsics-polyfill.h header

PiperOrigin-RevId: 461656651
diff --git a/src/f16-velu/avx2-rr1-p3.c.in b/src/f16-velu/avx2-rr1-p3.c.in
index 3889da3..e97167b 100644
--- a/src/f16-velu/avx2-rr1-p3.c.in
+++ b/src/f16-velu/avx2-rr1-p3.c.in
@@ -11,6 +11,7 @@
 #include <immintrin.h>
 
 #include <xnnpack/common.h>
+#include <xnnpack/intrinsics-polyfill.h>
 #include <xnnpack/vunary.h>
 
 
diff --git a/src/f16-velu/gen/velu-avx2-rr1-p3-x16.c b/src/f16-velu/gen/velu-avx2-rr1-p3-x16.c
index f9c8838..cd24642 100644
--- a/src/f16-velu/gen/velu-avx2-rr1-p3-x16.c
+++ b/src/f16-velu/gen/velu-avx2-rr1-p3-x16.c
@@ -12,6 +12,7 @@
 #include <immintrin.h>
 
 #include <xnnpack/common.h>
+#include <xnnpack/intrinsics-polyfill.h>
 #include <xnnpack/vunary.h>
 
 
diff --git a/src/f16-velu/gen/velu-avx2-rr1-p3-x8.c b/src/f16-velu/gen/velu-avx2-rr1-p3-x8.c
index 13fcf41..cfdba7f 100644
--- a/src/f16-velu/gen/velu-avx2-rr1-p3-x8.c
+++ b/src/f16-velu/gen/velu-avx2-rr1-p3-x8.c
@@ -12,6 +12,7 @@
 #include <immintrin.h>
 
 #include <xnnpack/common.h>
+#include <xnnpack/intrinsics-polyfill.h>
 #include <xnnpack/vunary.h>