Make "tr" command use POSIX compliant; export HOSTOS make variable

Patch by Murray Jensen, 30 Jun 2005

CHANGELOG

@@ -2,6 +2,9 @@
 Changes for U-Boot 1.1.3:
 ======================================================================
 
+* Make "tr" command use POSIX compliant; export HOSTOS make variable
+  Patch by Murray Jensen, 30 Jun 2005
+
 * Fix Murray Jensen's mail address.
   Patch by Murray Jensen, 30 Jun 2005
 

Makefile

@@ -29,10 +29,10 @@ HOSTARCH := $(shell uname -m | \
 	    -e s/powerpc/ppc/ \
 	    -e s/macppc/ppc/)
 
-HOSTOS := $(shell uname -s | tr A-Z a-z | \
+HOSTOS := $(shell uname -s | tr '[:upper:]' '[:lower:]' | \
 	    sed -e 's/\(cygwin\).*/cygwin/')
 
-export	HOSTARCH
+export	HOSTARCH HOSTOS
 
 # Deal with colliding definitions from tcsh etc.
 VENDOR=