meta: Drop further remnants of uclibc support

uclibc support was removed a while ago and musl works much better. Start to
remove the various overrides and patches related to uclibc which are no longer
needed.

uclibc support in a layer would still be possible. I have strong reasons to
believe nobody is still using uclibc since patches are missing and I doubt
the metadata even parses anymore.

(From OE-Core rev: ec03023d2165b49a52b83bac1ea2f0bfded7b852)

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/classes/image.bbclass

@@ -85,7 +85,6 @@ PID = "${@os.getpid()}"
 PACKAGE_ARCH = "${MACHINE_ARCH}"
 
 LDCONFIGDEPEND ?= "ldconfig-native:do_populate_sysroot"
-LDCONFIGDEPEND_libc-uclibc = ""
 LDCONFIGDEPEND_libc-musl = ""
 
 # This is needed to have depmod data in PKGDATA_DIR,