package/Config.in: put llvm packages at the right place

check-package is verifying the alphabetic ordering of package names,
not directory, so package/llvm-project/clang/Config.in should be
sorted as "clang" and not "llvm-project".

Fixes:

package/Config.in:2130: Packages in: menu "Other",
                        are not alphabetically ordered;
                        correct order: '-', '_', digits, capitals, lowercase;
                        first incorrect package: clang

In:

  https://gitlab.com/buildroot.org/buildroot/-/jobs/4718833134

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

package/Config.in

@@ -2025,7 +2025,9 @@ menu "Other"
 	source "package/catch2/Config.in"
 	source "package/cctz/Config.in"
 	source "package/cereal/Config.in"
+	source "package/llvm-project/clang/Config.in"
 	source "package/cmocka/Config.in"
+	source "package/llvm-project/compiler-rt/Config.in"
 	source "package/cppcms/Config.in"
 	source "package/cracklib/Config.in"
 	source "package/dawgdic/Config.in"
@@ -2067,6 +2069,7 @@ menu "Other"
 	source "package/libcap/Config.in"
 	source "package/libcap-ng/Config.in"
 	source "package/libcgroup/Config.in"
+	source "package/llvm-project/libclc/Config.in"
 	source "package/libcofi/Config.in"
 	source "package/libcorrect/Config.in"
 	source "package/libcrossguid/Config.in"
@@ -2127,9 +2130,6 @@ comment "linux-pam plugins"
 	source "package/libpam-tacplus/Config.in"
 endif
 	source "package/liquid-dsp/Config.in"
-	source "package/llvm-project/clang/Config.in"
-	source "package/llvm-project/compiler-rt/Config.in"
-	source "package/llvm-project/libclc/Config.in"
 	source "package/llvm-project/llvm/Config.in"
 	source "package/lttng-libust/Config.in"
 	source "package/matio/Config.in"