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meson: Handle the b_lto option as a string option for newer meson versions

Since 3e6fbde94c1cb8d4e01b7daf0282c315ff0e6c7d in meson (past the
0.56 release), the b_lto option was changed from a bool to a
tristate option (false/true/thin).

One could just compare the b_lto option against 'false', but that
causes warnings on older meson versions (on all existing releases).

--- a/tests/libfuzzer/meson.build

+++ b/tests/libfuzzer/meson.build

@@ -72,8 +72,15 @@

 objcopy = find_program('objcopy',

                        required: false)

+

+if meson.version().version_compare('<0.56.99')

+    lto = get_option('b_lto') ? 'true' : 'false'

+else

+    lto = get_option('b_lto')

+endif

+

 if (objcopy.found() and

-    not get_option('b_lto') and

+    lto == 'false' and

     get_option('default_library') == 'static' and

     cc.has_function('posix_memalign', prefix : '#include <stdlib.h>', args : test_args))