gobject-introspection: wrapper: add .libs to LD_LIBRARY_PATH for emulator

fixes issues like
libdbusmenu-gtk3-aarch64-unknown-linux-gnu> /build/libdbusmenu-16.04.0/libdbusmenu-gtk/tmp-introspect2jhtiwwn/.libs/DbusmenuGtk3-0.4:
error while loading shared libraries: libdbusmenu-glib.so.4: cannot open shared object file: No such file or directory
in non-meson builds

i think the reason we need this in all non-meson builds is because of ./pkgs/development/libraries/gobject-introspection/absolute_shlib_path.patch

see: https://github.com/void-linux/void-packages/blob/master/srcpkgs/gobject-introspection/files/g-ir-scanner-qemuwrapper
https://github.com/openembedded/openembedded-core/blob/c5a14f39a6717a99b510cb97aa2fb403d4b98d99/meta/recipes-gnome/gobject-introspection/gobject-introspection_1.72.0.bb#L74

pkgs/development/libraries/gobject-introspection/wrapper.nix

···
     (
       export bash="${buildPackages.bash}"
       export emulator=${lib.escapeShellArg (stdenv.targetPlatform.emulator buildPackages)}
+      export emulatorwrapper="$dev/bin/g-ir-scanner-qemuwrapper"
       export buildobjdump="${buildPackages.stdenv.cc.bintools}/bin/objdump"
 
       export targetgir="${lib.getDev (targetPackages.gobject-introspection-unwrapped.override argsForTarget)}"
···
       substituteAll "${./wrappers/g-ir-compiler.sh}" "$dev/bin/g-ir-compiler"
       substituteAll "${./wrappers/g-ir-scanner.sh}" "$dev/bin/g-ir-scanner"
       substituteAll "${./wrappers/g-ir-scanner-lddwrapper.sh}" "$dev/bin/g-ir-scanner-lddwrapper"
-      chmod +x "$dev/bin/g-ir-compiler"
-      chmod +x "$dev/bin/g-ir-scanner"
-      chmod +x "$dev/bin/g-ir-scanner-lddwrapper"
+      substituteAll "${./wrappers/g-ir-scanner-qemuwrapper.sh}" "$dev/bin/g-ir-scanner-qemuwrapper"
+      chmod +x $dev/bin/g-ir-*
     )
   ''
   # when cross-compiling and using the wrapper then when a package looks up the g_ir_X

pkgs/development/libraries/gobject-introspection/wrappers/g-ir-compiler.sh

···
 #! @bash@/bin/bash
 # shellcheck shell=bash
 
-exec @emulator@ @targetgir@/bin/g-ir-compiler "$@"
+exec @emulatorwrapper@ @targetgir@/bin/g-ir-compiler "$@"

pkgs/development/libraries/gobject-introspection/wrappers/g-ir-scanner-qemuwrapper.sh

···
+#! @bash@/bin/bash
+# shellcheck shell=bash
+
+# fixes issues like
+# libdbusmenu-gtk3-aarch64-unknown-linux-gnu> /build/libdbusmenu-16.04.0/libdbusmenu-gtk/tmp-introspect2jhtiwwn/.libs/DbusmenuGtk3-0.4:
+# error while loading shared libraries: libdbusmenu-glib.so.4: cannot open shared object file: No such file or directory
+# in non-meson builds
+
+# see: https://github.com/void-linux/void-packages/blob/master/srcpkgs/gobject-introspection/files/g-ir-scanner-qemuwrapper
+# https://github.com/openembedded/openembedded-core/blob/c5a14f39a6717a99b510cb97aa2fb403d4b98d99/meta/recipes-gnome/gobject-introspection/gobject-introspection_1.72.0.bb#L74
+while read -r d; do \
+    # some meson projects may have subprojects which use makefiles for docs(e.g. gi-docgen), ignore those as they will never be needed
+    if [[ -f "$d/Makefile" && "$d" != *"subproject"* ]]; then
+        GIR_EXTRA_LIBS_PATH="$(readlink -f "$d/.libs"):$GIR_EXTRA_LIBS_PATH"
+        export GIR_EXTRA_LIBS_PATH
+    fi
+done < <(find "$NIX_BUILD_TOP" -type d)
+
+# quoting broke the build of atk
+# shellcheck disable=2086
+exec @emulator@ ${GIR_EXTRA_OPTIONS:-} \
+    ${GIR_EXTRA_LIBS_PATH:+-E LD_LIBRARY_PATH="${GIR_EXTRA_LIBS_PATH}"} \
+    "$@"

pkgs/development/libraries/gobject-introspection/wrappers/g-ir-scanner.sh

···
 # shellcheck shell=bash
 
 exec @dev@/bin/.g-ir-scanner-wrapped \
-    --use-binary-wrapper=@emulator@ \
+    --use-binary-wrapper=@emulatorwrapper@ \
     --use-ldd-wrapper=@dev@/bin/g-ir-scanner-lddwrapper \
     "$@"