port alpha - the next build break!

[Paul Goyette <paul%whooppee.com@localhost>]

With sources updated just a few minutes ago...

#   compile  libarch/alpha_pci_io.o
/build/netbsd-local/tools/x86_64/alpha/bin/alpha--netbsd-gcc -O2 -std=gnu99  
-Wall -Wstrict-prototypes -Wmissing-prototypes -Wpointer-arith 
-Wno-sign-compare  -Wno-traditional  -Wa,--fatal-warnings -Wreturn-type 
-Wswitch -Wshadow -Wcast-qual -Wwrite-strings -Wextra -Wno-unused-parameter 
-Wno-sign-compare -Wold-style-definition -Wsign-compare -Wformat=2   
-Wno-format-zero-length  -Werror  -mieee 
--sysroot=/build/netbsd-local/dest/alpha  -c    
/build/netbsd-local/src/lib/libarch/alpha/alpha_pci_io.c -o alpha_pci_io.o
cc1: warnings being treated as errors
/build/netbsd-local/src/lib/libarch/alpha/alpha_pci_io.c: In function 
'alpha_pci_io_swiz_inb':
/build/netbsd-local/src/lib/libarch/alpha/alpha_pci_io.c:167:2: error: 
implicitdeclaration of function 'alpha_mb'
*** [alpha_pci_io.o] Error code 1


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