gobject-introspection: Do not hardcode objdump name

Use OBJDUMP variable in the script, this helps in using the lddwrapper
with recipes which maybe using different objdump tools e.g.l
llvm-objdump or vice-versa

(From OE-Core rev: c04b3e0e371859c159b76bff87a5b1299b51d0c8)

Signed-off-by: Khem Raj <raj.khem@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-gnome/gobject-introspection/gobject-introspection_1.72.0.bb

@@ -103,7 +103,7 @@ EOF
         # for a different architecture
         cat > ${B}/g-ir-scanner-lddwrapper << EOF
 #!/bin/sh
-$OBJDUMP -p "\$@"
+\$OBJDUMP -p "\$@"
 EOF
         chmod +x ${B}/g-ir-scanner-lddwrapper