pkg-config-wrapper: mangle PKG_CONFIG_PATH{,_FOR_BUILD} correctly

Previously, mangleVarList would be used which would concatenate the
variables using a space as a separator. Paths are however separated by
`:` in PKG_CONFIG_PATH leading to entries being broken.

This is fixed by introducing mangleVarListGeneric which allows us to
specify the desired separator.

Reproducer for the issue prior to this change:

$ nix-shell -A pkgsLLVM.wayland
[nix-shell] $ pkg-config --libs expat
Package expat was not found in the pkg-config search path.
Perhaps you should add the directory containing `expat.pc'
to the PKG_CONFIG_PATH environment variable
No package 'expat' found
$ printf 'Host: %s\nBuild: %s' $PKG_CONFIG_PATH $PKG_CONFIG_PATH_FOR_BUILD
Host: /nix/store/5h308a4ab8w7prcp8iflh5pnl78mayi2-expat-2.2.10-x86_64-unknown-linux-gnu-dev/lib/pkgconfig:/nix/store/z3y9ska2h4l1map25m195iq577g7g3gz-libxml2-x86_64-unknown-linux-gnu-2.9.12-dev/lib/pkgconfig:/nix/store/lbz5m1s0r7zn0cxvl21czfspli6ribzb-zlib-1.2.11-x86_64-unknown-linux-gnu-dev/lib/pkgconfig:/nix/store/rfhvp8r8n3ygpzh8j0l34lk8hwwi3z0h-libffi-3.3-x86_64-unknown-linux-gnu-dev/lib/pkgconfig
Build: /nix/store/dw11ywy7qwfz53qisz0dggbgix88jah2-wayland-1.19.0-bin/lib/pkgconfig

strace reveals the issue:

stat("/nix/store/dw11ywy7qwfz53qisz0dggbgix88jah2-wayland-1.19.0-bin/lib/pkgconfig /nix/store/5h308a4ab8w7prcp8iflh5pnl78mayi2-expat-2.2.10-x86_64-unknown-linux-gnu-dev/lib/pkgconfig/expat-uninstalled.pc", 0x7fff49829fa0) = -1 ENOENT (No such file or directory)

In the pkg-config wrapper $PKG_CONFIG_PATH_FOR_BUILD and
$PKG_CONFIG_PATH are concatenated with a space which leads to two paths
being messed up. This issue likely only affects native cross
compilation.

pkgs/build-support/pkg-config-wrapper/add-flags.sh

···
 accumulateRoles
 
 for var in "${var_templates_list[@]}"; do
-    mangleVarList "$var" ${role_suffixes[@]+"${role_suffixes[@]}"}
+    mangleVarListGeneric ":" "$var" ${role_suffixes[@]+"${role_suffixes[@]}"}
 done
 
 export NIX_PKG_CONFIG_WRAPPER_FLAGS_SET_@suffixSalt@=1

pkgs/build-support/wrapper-common/utils.bash

···
     fi
 }
 
-mangleVarList() {
+mangleVarListGeneric() {
+    local sep="$1"
+    shift
     local var="$1"
     shift
     local -a role_suffixes=("$@")
···
     for suffix in "${role_suffixes[@]}"; do
         local inputVar="${var}${suffix}"
         if [ -v "$inputVar" ]; then
-            export ${outputVar}+="${!outputVar:+ }${!inputVar}"
+            export ${outputVar}+="${!outputVar:+$sep}${!inputVar}"
         fi
     done
+}
+
+mangleVarList() {
+    mangleVarListGeneric " " "$@"
 }
 
 mangleVarBool() {