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driver: Populate PREFIX in Makefiles

PREFIX is a variable in the top Makefile and it was not
propagated to the recursive Makefiles. Setting PREFIX
like an environment variable of the first Makefile
called makes it visible to all the other Makefiles.

--- a/Makefile

+++ b/Makefile

@@ -14,7 +14,7 @@

 NODEP = 1

 all:

-	+@$(MAKE) `$(SCRIPTDIR)/config` toolchain

+	+@PREFIX=$(PREFIX) $(MAKE) `$(SCRIPTDIR)/config` toolchain

 	+@$(MAKE) `$(SCRIPTDIR)/config` `uname -m`

 x86_64 amd64: FORCE

--- a/src/cmd/cc/posix/mkconf

+++ b/src/cmd/cc/posix/mkconf

@@ -5,11 +5,9 @@

 rm -f config.h

 trap "rm -f $$.h" 0 2 3

-PREFIX=${PREFIX-$HOME}

-

 echo $@ |

 (IFS='- 	' read arch abi sys format r

-echo \#define PREFIX \"$PREFIX\"

+echo \#define PREFIX \"${PREFIX-$HOME}\"

 echo \#define ARCH \"$arch\"

 echo \#define SYS  \"$sys\"

 echo \#define ABI  \"$abi\"