glsl: Inherrit type of declared variable from initializer

glsl: Inherrit type of declared variable from initializer

Types of declared variables and their initializer must match excatly
except for unsized arrays.  Previously the type inherritance for
unsized arrays happened implicitly in the emitted assignment.
However, this assignment is never emitted for uniforms.  Now that type
is explicitly copied unconditionally.

Fixes piglit test array-compare-04.vert (bugzilla #32035) and
glsl-array-uniform-length (bugzilla #31985).

NOTE: This is a candidate for the 7.9 branch.