Avoid depending on static libhwy for shared libjxl consumers

--- lib/jxl.cmake.orig	2021-10-04 18:02:44 UTC
+++ lib/jxl.cmake
@@ -557,7 +557,7 @@ endif()  # TARGET_SUPPORTS_SHARED_LIBS AND NOT JPEGXL_
 
 # Add a pkg-config file for libjxl.
 set(JPEGXL_LIBRARY_REQUIRES
-    "libhwy libbrotlicommon libbrotlienc libbrotlidec")
+    "libbrotlicommon libbrotlienc libbrotlidec")
 if(NOT JPEGXL_ENABLE_SKCMS)
   set(JPEGXL_LIBRARY_REQUIRES "${JPEGXL_LIBRARY_REQUIRES} lcms2")
 endif()
--- lib/jxl/libjxl.pc.in.orig	2021-10-04 18:02:44 UTC
+++ lib/jxl/libjxl.pc.in
@@ -8,5 +8,5 @@ Description: Loads and saves JPEG XL files
 Version: @JPEGXL_LIBRARY_VERSION@
 Requires.private: @JPEGXL_LIBRARY_REQUIRES@
 Libs: -L${libdir} -ljxl
-Libs.private: -lm
+Libs.private: -lhwy -lm
 Cflags: -I${includedir}
