SVN r257228 breaks kernel build with gcc

[Michael Butler]

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That is ..

- --- busdma_bounce.o ---
cc1: warnings being treated as errors
In file included from /usr/src/sys/x86/x86/busdma_bounce.c:54:
/usr/src/sys/x86/include/busdma_impl.h:85: warning: redundant
redeclaration of 'busdma_lock_mutex' [-Wredundant-decls]
/usr/src/sys/sys/bus_dma.h:150: warning: previous declaration of
'busdma_lock_mutex' was here
*** [busdma_bounce.o] Error code 1

	imb
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