package/neon-2-sse: add missing coment

That was missed when applying ee399a8689 (package/neon-2-sse: new
package)...

Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>

package/neon-2-sse/neon-2-sse.mk

@@ -9,6 +9,7 @@ NEON_2_SSE_SITE = $(call github,intel,ARM_NEON_2_x86_SSE,$(NEON_2_SSE_VERSION))
 NEON_2_SSE_LICENSE = BSD-2-Clause
 NEON_2_SSE_LICENSE_FILES = LICENSE
 NEON_2_SSE_INSTALL_STAGING = YES
+# Only installs a header
 NEON_2_SSE_INSTALL_TARGET = NO
 
 $(eval $(cmake-package))