make: install windows binaries with .exe extension

[ploxiln]

also threw in some other subjective Makefile refactoring, but would be fine with undoing it

new dist.sh output:

... building v0.3.7 for freebsd/amd64
go build  -o build/nsqd ./apps/nsqd
go build  -o build/nsqlookupd ./apps/nsqlookupd
go build  -o build/nsqadmin ./apps/nsqadmin
go build  -o build/nsq_pubsub ./apps/nsq_pubsub
go build  -o build/nsq_to_nsq ./apps/nsq_to_nsq
go build  -o build/nsq_to_file ./apps/nsq_to_file
go build  -o build/nsq_to_http ./apps/nsq_to_http
go build  -o build/nsq_tail ./apps/nsq_tail
go build  -o build/nsq_stat ./apps/nsq_stat
go build  -o build/to_nsq ./apps/to_nsq
install -m 755 -d /var/folders/ny/tsl8z9qx453630cxnzw0_dj80000gn/T/nsq.l5IgN3bd/nsq-0.3.7.freebsd-amd64.go1.5.3/bin
for APP in nsqd nsqlookupd nsqadmin nsq_pubsub nsq_to_nsq nsq_to_file nsq_to_http nsq_tail nsq_stat to_nsq ; do install -m 755 build/$APP /var/folders/ny/tsl8z9qx453630cxnzw0_dj80000gn/T/nsq.l5IgN3bd/nsq-0.3.7.freebsd-amd64.go1.5.3/bin/$APP ; done
/var/folders/ny/tsl8z9qx453630cxnzw0_dj80000gn/T/nsq.l5IgN3bd ~/scratch/nsq
a nsq-0.3.7.freebsd-amd64.go1.5.3
a nsq-0.3.7.freebsd-amd64.go1.5.3/bin
a nsq-0.3.7.freebsd-amd64.go1.5.3/bin/nsq_pubsub
a nsq-0.3.7.freebsd-amd64.go1.5.3/bin/nsq_stat
a nsq-0.3.7.freebsd-amd64.go1.5.3/bin/nsq_tail
a nsq-0.3.7.freebsd-amd64.go1.5.3/bin/nsq_to_file
a nsq-0.3.7.freebsd-amd64.go1.5.3/bin/nsq_to_http
a nsq-0.3.7.freebsd-amd64.go1.5.3/bin/nsq_to_nsq
a nsq-0.3.7.freebsd-amd64.go1.5.3/bin/nsqadmin
a nsq-0.3.7.freebsd-amd64.go1.5.3/bin/nsqd
a nsq-0.3.7.freebsd-amd64.go1.5.3/bin/nsqlookupd
a nsq-0.3.7.freebsd-amd64.go1.5.3/bin/to_nsq
~/scratch/nsq
rm -fr build
... building v0.3.7 for windows/amd64
go build  -o build/nsqd ./apps/nsqd
go build  -o build/nsqlookupd ./apps/nsqlookupd
go build  -o build/nsqadmin ./apps/nsqadmin
go build  -o build/nsq_pubsub ./apps/nsq_pubsub
go build  -o build/nsq_to_nsq ./apps/nsq_to_nsq
go build  -o build/nsq_to_file ./apps/nsq_to_file
go build  -o build/nsq_to_http ./apps/nsq_to_http
go build  -o build/nsq_tail ./apps/nsq_tail
go build  -o build/nsq_stat ./apps/nsq_stat
go build  -o build/to_nsq ./apps/to_nsq
install -m 755 -d /var/folders/ny/tsl8z9qx453630cxnzw0_dj80000gn/T/nsq.o3E3opyF/nsq-0.3.7.windows-amd64.go1.5.3/bin
for APP in nsqd nsqlookupd nsqadmin nsq_pubsub nsq_to_nsq nsq_to_file nsq_to_http nsq_tail nsq_stat to_nsq ; do install -m 755 build/$APP /var/folders/ny/tsl8z9qx453630cxnzw0_dj80000gn/T/nsq.o3E3opyF/nsq-0.3.7.windows-amd64.go1.5.3/bin/$APP.exe ; done
/var/folders/ny/tsl8z9qx453630cxnzw0_dj80000gn/T/nsq.o3E3opyF ~/scratch/nsq
a nsq-0.3.7.windows-amd64.go1.5.3
a nsq-0.3.7.windows-amd64.go1.5.3/bin
a nsq-0.3.7.windows-amd64.go1.5.3/bin/nsq_pubsub.exe
a nsq-0.3.7.windows-amd64.go1.5.3/bin/nsq_stat.exe
a nsq-0.3.7.windows-amd64.go1.5.3/bin/nsq_tail.exe
a nsq-0.3.7.windows-amd64.go1.5.3/bin/nsq_to_file.exe
a nsq-0.3.7.windows-amd64.go1.5.3/bin/nsq_to_http.exe
a nsq-0.3.7.windows-amd64.go1.5.3/bin/nsq_to_nsq.exe
a nsq-0.3.7.windows-amd64.go1.5.3/bin/nsqadmin.exe
a nsq-0.3.7.windows-amd64.go1.5.3/bin/nsqd.exe
a nsq-0.3.7.windows-amd64.go1.5.3/bin/nsqlookupd.exe
a nsq-0.3.7.windows-amd64.go1.5.3/bin/to_nsq.exe
~/scratch/nsq
rm -fr build

[mreiferson]

I like it, thanks @ploxiln