xfce4-settings: upgrade 4.20.0 -> 4.20.1

Drop unnecessary CFLAGS.  They were introduced with xfce4-settings version
4.18.3 to address two errors seen at the time - deprecated declarations and
implicit declarations.  The error was documented here :

https://patchwork.yoctoproject.org/project/oe/patch/20241127005545.86128-1-schonm@gmail.com/

Both of these errors have been addressed.

This change to the code base fixed the deprecated declarations:
https://gitlab.xfce.org/xfce/xfce4-settings/-/commit/def01fc82caac1cb41d3b7c242efa7f98d48e9a6

This change to the code base fixed the implicit declaration :
https://gitlab.xfce.org/xfce/xfce4-settings/-/commit/10e40cdf13f1440d207a50a3f19fc4903da0d80a

Changelog: https://gitlab.xfce.org/xfce/xfce4-settings/-/tags/xfce4-settings-4.20.1

Signed-off-by: Jason Schonberg <schonm@gmail.com>
Signed-off-by: Khem Raj <raj.khem@gmail.com>

meta-xfce/recipes-xfce/xfce4-settings/xfce4-settings_4.20.0.bb → meta-xfce/recipes-xfce/xfce4-settings/xfce4-settings_4.20.1.bb

@@ -8,9 +8,8 @@ inherit xfce features_check mime-xdg
 
 REQUIRED_DISTRO_FEATURES = "x11"
 
-SRC_URI[sha256sum] = "23548da3429a296501fbfdbc98a861ee241b9fdd47e8d5de1781f57c6bbce5a9"
+SRC_URI[sha256sum] = "fd0d602853ea75d94024e5baae2d2bf5ca8f8aa4dad7bfd5d08f9ff8afee77b2"
 
-CFLAGS += " -Wno-deprecated-declarations -Wno-implicit-function-declaration"
 EXTRA_OECONF += " \
     GDBUS_CODEGEN=${STAGING_BINDIR_NATIVE}/gdbus-codegen \
     --enable-maintainer-mode --disable-debug \