fix btrfs-progs build

[Christian Hesse <list@eworm.de>]

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Hello everybody,

man pages for btrfs-progs are compressed by gzip by default. In Makefile the
variable GZIP is use, this evaluates to 'gzip gzip' on my system. From man
gzip:

> The environment variable GZIP can hold a set of default options for gzip.
> These options are interpreted first and can be overwritten by explicit
> command line parameters.

So using any other variable name fixes this. Patch is attached.
-- 
main(a){char*c=/*    Schoene Gruesse                         */"B?IJj;MEH"
"CX:;",b;for(a/*    Chris           get my mail address:    */=0;b=c[a++];)
putchar(b-1/(/*               gcc -o sig sig.c && ./sig    */b/42*2-3)*42);}

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diff --git a/man/Makefile b/man/Makefile
index 4a90b75..f7b57f7 100644
--- a/man/Makefile
+++ b/man/Makefile
@@ -1,4 +1,4 @@
-GZIP=gzip
+GZIPCMD=gzip
 INSTALL= install
 
 prefix ?= /usr/local
@@ -12,22 +12,22 @@ MANPAGES = mkfs.btrfs.8.gz btrfsctl.8.gz btrfsck.8.gz btrfs-image.8.gz \
 all: $(MANPAGES)
 
 mkfs.btrfs.8.gz: mkfs.btrfs.8.in
-	$(GZIP) -n -c mkfs.btrfs.8.in > mkfs.btrfs.8.gz
+	$(GZIPCMD) -n -c mkfs.btrfs.8.in > mkfs.btrfs.8.gz
 
 btrfs.8.gz: btrfs.8.in
-	$(GZIP) -n -c btrfs.8.in > btrfs.8.gz
+	$(GZIPCMD) -n -c btrfs.8.in > btrfs.8.gz
 
 btrfsctl.8.gz: btrfsctl.8.in
-	$(GZIP) -n -c btrfsctl.8.in > btrfsctl.8.gz
+	$(GZIPCMD) -n -c btrfsctl.8.in > btrfsctl.8.gz
 
 btrfsck.8.gz: btrfsck.8.in
-	$(GZIP) -n -c btrfsck.8.in > btrfsck.8.gz
+	$(GZIPCMD) -n -c btrfsck.8.in > btrfsck.8.gz
 
 btrfs-image.8.gz: btrfs-image.8.in
-	$(GZIP) -n -c btrfs-image.8.in > btrfs-image.8.gz
+	$(GZIPCMD) -n -c btrfs-image.8.in > btrfs-image.8.gz
 
 btrfs-show.8.gz: btrfs-show.8.in
-	$(GZIP) -n -c btrfs-show.8.in > btrfs-show.8.gz
+	$(GZIPCMD) -n -c btrfs-show.8.in > btrfs-show.8.gz
 
 clean :
 	rm -f $(MANPAGES)