vala: Fix install conflict when enable multilib.

Error: Transaction test error:
   file /usr/bin/vala-gen-introspect-0.56 conflicts between attempted installs of lib32-vala-0.56.3-r0.armv7ahf_neon and vala-0.56.3-r0.aarch64
   file /usr/bin/vapigen-wrapper conflicts between attempted installs
   of lib32-vala-0.56.3-r0.armv7ahf_neon and vala-0.56.3-r0.aarch64

The differences of vala-gen-introspect-0.56 are as follows:
@@ -2,7 +2,7 @@

 prefix=/usr
 exec_prefix=/usr
-libdir=/usr/lib64
+libdir=/usr/lib
 pkglibdir=${libdir}/vala-0.56

 if [ $# -ne 2 ]

The wrapper isn't used on target so we can simply delete it.

(From OE-Core rev: 21e8a662e6232e7fdd642b1d86d4f8f980be1a09)

Signed-off-by: Wang Mingyu <wangmy@fujitsu.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
(cherry picked from commit 3cf894b8a9c4fa14fcc7c7445e85e9ae3192b398)
Signed-off-by: Steve Sakoman <steve@sakoman.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-devtools/vala/vala.inc

@@ -50,6 +50,9 @@ do_install:append:class-target() {
 # vapi files.
 SYSROOT_DIRS += "${bindir_crossscripts}"
 
+inherit multilib_script
+MULTILIB_SCRIPTS = "${PN}:${bindir}/vala-gen-introspect-0.56"
+
 SYSROOT_PREPROCESS_FUNCS:append:class-target = " vapigen_sysroot_preprocess"
 vapigen_sysroot_preprocess() {
         # Tweak the vapigen name in the vapigen pkgconfig file, so that it picks
@@ -64,5 +67,5 @@ SSTATE_SCAN_FILES += "vapigen-wrapper"
 PACKAGE_PREPROCESS_FUNCS += "vala_package_preprocess"
 
 vala_package_preprocess () {
-	sed -i -e 's:${RECIPE_SYSROOT}::g;' ${PKGD}${bindir_crossscripts}/vapigen-wrapper
+	rm -rf ${PKGD}${bindir_crossscripts}
 }