Update Mesa and friends to 7.4.2.
Update provided by Hasso Tepper on pkgsrc-users.

Changes:
7.4.2:
Bug fixes

  * Fixed segfault when rendering to front buffer with DRI 1.
  * Fixed swrast texture rectangle bug when wrap mode = GL_CLAMP_TO_BORDER and filter mode = GL_LINEAR. (bug
    21461)
  * Fixed texture object mem leak during context destruction.
  * Fixed a state validation bug in glCopyTex[Sub]Image()
  * Fixed some i965 GLSL bugs.
  * Fixed an R300 driver texture object bad memory reference.

7.4.1:
Bug fixes

  * Fixed a two-sided lighting bug in fixed-function-to-GPU code generation
  * Fixed some Darwin issues (Jeremy Huddleston)
  * Indexing the GLSL gl_EyePlane[] or gl_ObjectPlane[] arrays with a variable was broken, bug 20986
  * Fixed incorrect texture unit bias in TXB instruction
  * glTexParameter settings weren't always propogated to drivers
  * Assorted vertex/fragment program bug fixes
  * Fixed point rendering in software rasterizer
  * Fixed potential deadlock in object hash functions
  * Fix a couple bugs surrounding front-buffer rendering with DRI2, but this is not quite complete.
  * Fixed glPopAttrib() bug when restoring user clip planes

7.4:
New features

  * Added MESA_GLX_FORCE_DIRECT env var for Xlib/software driver
  * GLSL version 1.20 is returnd by the GL_SHADING_LANGUAGE_VERSION query

Bug fixes

  * glGetActiveUniform() returned wrong size for some array types
  * Fixed some error checking in glUniform()
  * Fixed a potential glTexImage('proxy target') segfault
  * Fixed bad reference counting for 1D/2D texture arrays
  * Fixed VBO + glPush/PopClientAttrib() bug #19835
  * Assorted i965 driver bug fixes
  * Fixed a Windows compilation failure in s_triangle.c
  * Fixed a GLSL array indexing bug
  * Fixes for building on Haiku

Changes

  * Updated GL/glxext.h to version 48
  * Assorted updates for building on Solaris

7.3:
New features

  * Support for GLSL 1.20
  * Intel DRI drivers now use GEM and DRI2

Bug fixes

  * Assorted GLSL bug fixes
  * Assorted i965 driver fixes
  * Fix for wglCreateLayerContext() in WGL/Windows driver
  * Build fixes for OpenBSD and gcc 2.95
  * GLSL preprocessor handles #pragma now
  * Fix incorrect transformation of GL_SPOT_DIRECTION
  * Fixed several bugs (#18367 and #19625) in glXMakeContextCurrent()
  * Assorted Windows build fixes

Changes

  * Deprecated the "XMesa" interface (include/GL/xmesa*.h files)
  * Deprecated the "FXMesa" interface (include/GL/fxmesa.h file)
  * Deprecated the "Allegro" interface (include/GL/amesa.h file)
  * Removed include/GL/uglmesa.h header
  * Removed include/GLView.h header for BeOS

7.2:
New features

  * i965 driver: added support for G41 chipset (Intel)

Bug fixes

  * Fixed display list bug involving primitives split across lists (bug 17564)
  * Fixed some issues with glBindAttribLocation()
  * Fixed crash in _tnl_InvalidateState() found with Amira (bug 15834)
  * Assorted bug fixes for Ming build
  * Fixed some vertex/pixel buffer object reference counting bugs
  * Fixed depth/stencil bug in i915/945 driver
  * Fixed some shader flow control bugs in i965 driver
  * Fixed a few tdfx driver bugs which prevented driver from working
  * Fixed multisample enable/disable bug

Changes

  * Updated SGI header files with new license terms.

7.1:
New features

  * autoconf-based configuration (and clean-up of Makefiles)
  * Assorted DRI driver enhancements
  * Reduced dependencies between X server and Mesa
  * GL_EXT_texture_from_pixmap extension for Xlib driver
  * Support for the GL shading language with i965 driver (implemented by Intel)
  * ATI R500 series support (Radeon X1300-X1950) in r300 DRI driver

Bug fixes

  * Numerous GLSL fixes
  * Fixed some error code/detection bugs in the GLSL-related API functions
  * Lots of DRI driver fixes.

(wiz)