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,

meta/classes/native.bbclass

@@ -108,7 +108,7 @@ PKG_CONFIG_SYSROOT_DIR = ""
 PKG_CONFIG_SYSTEM_LIBRARY_PATH[unexport] = "1"
 PKG_CONFIG_SYSTEM_INCLUDE_PATH[unexport] = "1"
 
-# we dont want libc-uclibc or libc-glibc to kick in for native recipes
+# we dont want libc-*libc to kick in for native recipes
 LIBCOVERRIDE = ""
 CLASSOVERRIDE = "class-native"
 MACHINEOVERRIDES = ""

meta/classes/toolchain-scripts.bbclass

@@ -3,7 +3,6 @@ inherit toolchain-scripts-base siteinfo kernel-arch
 # We want to be able to change the value of MULTIMACH_TARGET_SYS, because it
 # doesn't always match our expectations... but we default to the stock value
 REAL_MULTIMACH_TARGET_SYS ?= "${MULTIMACH_TARGET_SYS}"
-TARGET_CC_ARCH_append_libc-uclibc = " -muclibc"
 TARGET_CC_ARCH_append_libc-musl = " -mmusl"
 
 # default debug prefix map isn't valid in the SDK