Paul Elder e9288e2ee5 meson: Update min clang version to 9 ...

__builtin_FILE and __builtin_LINE are first defined in clang 9. With
clang of any version less than that we have the following compilation
errors:

../../include/libcamera/base/log.h:94:27: error: use of undeclared identifier '__builtin_FILE'
                        const char *fileName = __builtin_FILE(),
                                               ^
../../include/libcamera/base/log.h:95:24: error: use of undeclared identifier '__builtin_LINE'
                        unsigned int line = __builtin_LINE()) const;
                                            ^
../../include/libcamera/base/log.h:99:26: error: use of undeclared identifier '__builtin_FILE'
                const char *fileName = __builtin_FILE(),
                                       ^
../../include/libcamera/base/log.h:100:23: error: use of undeclared identifier '__builtin_LINE'
                unsigned int line = __builtin_LINE());

Enforce clang version of at least 9 in the main meson file.

Signed-off-by: Paul Elder <paul.elder@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

2021-08-03 12:07:00 +09:00

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