mesa: Returns a GL_INVALID_VALUE error if num of texs in glDeleteTextures is negative

Per GLES3 manual for glDeleteTextures
<https://www.khronos.org/opengles/sdk/docs/man3/html/glDeleteTextures.xhtml>,
GL_INVALID_VALUE is generated if n is negative.

Fixes 1 dEQP test:
* dEQP-GLES3.functional.negative_api.texture.deletetextures

Reviewed-by: Ian Romanick <ian.d.romanick@intel.com>
mesa: Fix error reporting for some cases of incomplete FBO attachments

According to the OpenGL and OpenGL ES specs (sections
"FRAMEBUFFER COMPLETENESS" and "Whole Framebuffer Completeness"),
the image for color, depth or stencil attachments must be renderable,
otherwise the attachment is considered incomplete and we should report
GL_FRAMEBUFFER_INCOMPLETE_ATTACHMENT. Currently, we detect this
situation properly but report a different error.

This fixes the following 3 piglit tests:
dEQP-GLES3.functional.fbo.completeness.renderable.texture.color0.rgb_unsigned_int_2_10_10_10_rev
dEQP-GLES3.functional.fbo.completeness.renderable.texture.color0.rgba_unsigned_int_2_10_10_10_rev
dEQP-GLES3.functional.fbo.completeness.renderable.texture.color0.rgb16f

Reviewed-by: Ian Romanick <ian.d.romanick@intel.com>