clover: Fix build after clang r370122.

invocation.cpp:203:81: error: no matching function for call to ‘clang::CompilerInvocation::CreateFromArgs(clang::CompilerInvocation&, const char* const*, const char* const*, clang::DiagnosticsEngine&)’
              c->getInvocation(), copts.data(), copts.data() + copts.size(), diag))
                                                                                 ^

Signed-off-by: Vinson Lee <vlee@freedesktop.org>
22 jobs for !1794 with fix-clover-llvm-10-build in 34 minutes and 21 seconds (queued for 40 seconds)
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debian

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  Build+Test
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meson-arm64

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meson-armhf

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meson-clang

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meson-clover

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meson-i386

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meson-main

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meson-swr-glvnd

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meson-vulkan

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scons-llvm

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scons-nollvm

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scons-swr

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scons-win64

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  Test
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test-llvmpipe-gles2 1/4

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test-llvmpipe-gles2 3/4

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test-softpipe-gles3-limited

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