build-sys: use -Wno-gnu-variable-sized-type-not-at-end under clang
Otherwise we get useless warnings about journal code.
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@ -200,7 +200,9 @@ CC_CHECK_FLAGS_APPEND([with_cflags], [CFLAGS], [\
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AS_CASE([$CC], [*clang*],
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AS_CASE([$CC], [*clang*],
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[CC_CHECK_FLAGS_APPEND([with_cppflags], [CPPFLAGS], [\
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[CC_CHECK_FLAGS_APPEND([with_cppflags], [CPPFLAGS], [\
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-Wno-typedef-redefinition])])
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-Wno-typedef-redefinition \
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-Wno-gnu-variable-sized-type-not-at-end \
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])])
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AS_CASE([$CFLAGS], [*-O[[12345\ ]]*],
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AS_CASE([$CFLAGS], [*-O[[12345\ ]]*],
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[CC_CHECK_FLAGS_APPEND([with_cflags], [CFLAGS], [\
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[CC_CHECK_FLAGS_APPEND([with_cflags], [CFLAGS], [\
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