NOTE: This depends on new meson landing in TW ( https://build.opensuse.org/request/show/639505 )

- Update to version 1.5.3:
+ Fix build with uClibc
+ Fix GLES3 symbol lookup
+ Fix conditional compilation
+ Require Meson 0.47
+ Fix Autotools build with EGL-X11 support
- Changes from version 1.5.2:
+ Fix the detection of the -z,relro linker flag
+ Query the EGL context version when bootstrapping on GLES
+ Avoid inadvertedly loading libraries when probing for them
+ Consistently use abort() instead of exit() for internal state
checks
+ Fix a performance regression in the global function pointer
trampolines introduced by using -Bsymbolic-functions
+ Improve performance when using GL function pointers like
glAlphaFunc
- Changes from version 1.5.1:
+ Generalise checks for dlvsym
+ Add an option for disabling building the test suite
+ Typo fixes in the comments and documentation
+ Simplify the Meson configuration logic for EGL and GLX
+ Use assert when no context is found
+ Remove a test superceded by GLVND
+ Avoid Meson warnings when testing for linker arguments
- Pass tests=false to meson, ensure we do not build the test-suite.
- Drop la files removal, they are no longer built.
- Run spec-cleaner, modernize spec.