testsuite: skip T2615 on wasm

This commit marks T2615 as skip on wasm, given LD_* environment
variables aren't supported on wasm anyway.

(cherry picked from commit fefb4ea1)

testsuite/tests/rts/linker/all.T

@@ -39,6 +39,8 @@ test('T2615',
        when(opsys('solaris2'), skip),
        # OpenBSD linker does not support GNUish linker scripts
        when(opsys('openbsd'), expect_broken(20869)),
+       # LD_LIBRARY_PATH etc doesn't work on wasm
+       when(arch('wasm32'), skip),
        pre_cmd('$MAKE -s --no-print-directory T2615-prep'),
        # Add current directory to dlopen search path
        cmd_prefix('LD_LIBRARY_PATH=$LD_LIBRARY_PATH:. ')],