wayland-egl: set the correct path to libwayland-egl.so

Earlier commit changed to passing the binary name as env. variable
introducing a typo.

That went unnoticed, since we do not check if the file is present or
not.

Cc: Pukka Paalanen <ppaalanen@gmail.com>
Cc: Daniel Stone <daniels@collabora.com>
Fixes: 85cb5ed64aa ("wayland-egl-symbols-check: pass the DSO name via
the build system")
Signed-off-by: Emil Velikov <emil.velikov@collabora.com>
Reviewed-by: Pekka Paalanen <pekka.paalanen@collabora.co.uk>
diff --git a/Makefile.am b/Makefile.am
index 2731ee7..6f59c36 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -196,7 +196,7 @@
 	export WAYLAND_SCANNER='$(top_builddir)/wayland-scanner'	\
 	TEST_DATA_DIR='$(top_srcdir)/tests/data'			\
 	TEST_OUTPUT_DIR='$(top_builddir)/tests/output'			\
-	WAYLAND_EGL_LIB='$(top_builddir)/egl/.libs/libwayland-egl.so'	\
+	WAYLAND_EGL_LIB='$(top_builddir)/.libs/libwayland-egl.so'	\
 	SED=$(SED)							\
 	;