Rename makefiles BUILD.mk

This way they appear at the top of directory listings.

test/libc/fmt/BUILD.mk

@@ -48,7 +48,7 @@ o/$(MODE)/test/libc/fmt/%.com.dbg:			\
 		$(APE_NO_MODIFY_SELF)
 	@$(APELINK)
 
-$(TEST_LIBC_FMT_OBJS): test/libc/fmt/test.mk
+$(TEST_LIBC_FMT_OBJS): test/libc/fmt/BUILD.mk
 
 $(TEST_LIBC_FMT_OBJS): private				\
 	DEFAULT_CCFLAGS +=				\

test/libc/proc/BUILD.mk

@@ -115,7 +115,7 @@ o/$(MODE)/test/libc/proc/life-pe.com.zip.o: private		\
 		ZIPOBJ_FLAGS +=					\
 			-B
 
-$(TEST_LIBC_PROC_OBJS): test/libc/proc/test.mk
+$(TEST_LIBC_PROC_OBJS): test/libc/proc/BUILD.mk
 
 .PHONY: o/$(MODE)/test/libc/proc
 o/$(MODE)/test/libc/proc:					\

test/libc/sock/BUILD.mk

@@ -82,7 +82,7 @@ o/$(MODE)/test/libc/sock/recvmsg_test.com.runs:			\
 o/$(MODE)/test/libc/sock/recvmsg_test.com.runs:			\
 		private .PLEDGE = stdio rpath wpath cpath fattr proc inet recvfd sendfd
 
-$(TEST_LIBC_SOCK_OBJS): test/libc/sock/test.mk
+$(TEST_LIBC_SOCK_OBJS): test/libc/sock/BUILD.mk
 
 .PHONY: o/$(MODE)/test/libc/sock
 o/$(MODE)/test/libc/sock:					\

test/libc/stdio/BUILD.mk

@@ -79,7 +79,7 @@ $(TEST_LIBC_STDIO_OBJS): private				\
 		DEFAULT_CCFLAGS +=				\
 			-fno-builtin
 
-$(TEST_LIBC_STDIO_OBJS): test/libc/stdio/test.mk
+$(TEST_LIBC_STDIO_OBJS): test/libc/stdio/BUILD.mk
 
 .PHONY: o/$(MODE)/test/libc/stdio
 o/$(MODE)/test/libc/stdio:					\