x/mobile/exp/audio/al: export all constants from AL headers

The al package currently doesn't export some of the constants appear on the the AL headers such as AL_PITCH, AL_POSITION, AL_DIRECTION, AL_LOOPING, etc. The full is provided below, export them all.
/**
 * Relative source.
 * Type:    ALboolean
 * Range:   [AL_TRUE, AL_FALSE]
 * Default: AL_FALSE
 *
 * Specifies if the Source has relative coordinates.
 */
#define AL_SOURCE_RELATIVE                       0x202

/**
 * Inner cone angle, in degrees.
 * Type:    ALint, ALfloat
 * Range:   [0 - 360]
 * Default: 360
 *
 * The angle covered by the inner cone, where the source will not attenuate.
 */
#define AL_CONE_INNER_ANGLE                      0x1001

/**
 * Outer cone angle, in degrees.
 * Range:   [0 - 360]
 * Default: 360
 *
 * The angle covered by the outer cone, where the source will be fully
 * attenuated.
 */
#define AL_CONE_OUTER_ANGLE                      0x1002

/**
 * Source pitch.
 * Type:    ALfloat
 * Range:   [0.5 - 2.0]
 * Default: 1.0
 *
 * A multiplier for the frequency (sample rate) of the source's buffer.
 */
#define AL_PITCH                                 0x1003

/**
 * Source or listener position.
 * Type:    ALfloat[3], ALint[3]
 * Default: {0, 0, 0}
 *
 * The source or listener location in three dimensional space.
 *
 * OpenAL, like OpenGL, uses a right handed coordinate system, where in a
 * frontal default view X (thumb) points right, Y points up (index finger), and
 * Z points towards the viewer/camera (middle finger).
 *
 * To switch from a left handed coordinate system, flip the sign on the Z
 * coordinate.
 */
#define AL_POSITION                              0x1004

/**
 * Source direction.
 * Type:    ALfloat[3], ALint[3]
 * Default: {0, 0, 0}
 *
 * Specifies the current direction in local space.
 * A zero-length vector specifies an omni-directional source (cone is ignored).
 */
#define AL_DIRECTION                             0x1005

/**
 * Source or listener velocity.
 * Type:    ALfloat[3], ALint[3]
 * Default: {0, 0, 0}
 *
 * Specifies the current velocity in local space.
 */
#define AL_VELOCITY                              0x1006

/**
 * Source looping.
 * Type:    ALboolean
 * Range:   [AL_TRUE, AL_FALSE]
 * Default: AL_FALSE
 *
 * Specifies whether source is looping.
 */
#define AL_LOOPING                               0x1007

/**
 * Source buffer.
 * Type:  ALuint
 * Range: any valid Buffer.
 *
 * Specifies the buffer to provide sound samples.
 */
#define AL_BUFFER                                0x1009

/**
 * Source or listener gain.
 * Type:  ALfloat
 * Range: [0.0 - ]
 *
 * A value of 1.0 means unattenuated. Each division by 2 equals an attenuation
 * of about -6dB. Each multiplicaton by 2 equals an amplification of about
 * +6dB.
 *
 * A value of 0.0 is meaningless with respect to a logarithmic scale; it is
 * silent.
 */
#define AL_GAIN                                  0x100A

/**
 * Minimum source gain.
 * Type:  ALfloat
 * Range: [0.0 - 1.0]
 *
 * The minimum gain allowed for a source, after distance and cone attenation is
 * applied (if applicable).
 */
#define AL_MIN_GAIN                              0x100D

/**
 * Maximum source gain.
 * Type:  ALfloat
 * Range: [0.0 - 1.0]
 *
 * The maximum gain allowed for a source, after distance and cone attenation is
 * applied (if applicable).
 */
#define AL_MAX_GAIN                              0x100E

/**
 * Listener orientation.
 * Type: ALfloat[6]
 * Default: {0.0, 0.0, -1.0, 0.0, 1.0, 0.0}
 *
 * Effectively two three dimensional vectors. The first vector is the front (or
 * "at") and the second is the top (or "up").
 *
 * Both vectors are in local space.
 */
#define AL_ORIENTATION                           0x100F
golang / go

x/mobile/exp/audio/al: export all constants from AL headers #13913
