glsl: apply shader storage block member rules when adding program resources

glsl: apply shader storage block member rules when adding program resources

From ARB_program_interface_query:

"For an active shader storage block member declared as an array, an
 entry will be generated only for the first array element, regardless
 of its type. For arrays of aggregate types, the enumeration rules are
 applied recursively for the single enumerated array element."

v2:
- Simplify 'if' conditions and return true if it is not a buffer
  variable, because these rules only apply to buffer variables (Timothy).

Signed-off-by: Samuel Iglesias Gonsalvez <siglesias@igalia.com>
Reviewed-by: Timothy Arceri <t_arceri@yahoo.com.au>