Fix promu config (#1119)

Rename promu no-cgo config to default promu name to avoid crossbuild
problems.

Signed-off-by: Ben Kochie <superq@gmail.com>

.promu.yml

@@ -0,0 +1,29 @@
+repository:
+    path: github.com/prometheus/node_exporter
+build:
+    binaries:
+        - name: node_exporter
+    flags: -a -tags 'netgo static_build'
+    ldflags: |
+        -X {{repoPath}}/vendor/github.com/prometheus/common/version.Version={{.Version}}
+        -X {{repoPath}}/vendor/github.com/prometheus/common/version.Revision={{.Revision}}
+        -X {{repoPath}}/vendor/github.com/prometheus/common/version.Branch={{.Branch}}
+        -X {{repoPath}}/vendor/github.com/prometheus/common/version.BuildUser={{user}}@{{host}}
+        -X {{repoPath}}/vendor/github.com/prometheus/common/version.BuildDate={{date "20060102-15:04:05"}}
+tarball:
+    files:
+        - LICENSE
+        - NOTICE
+crossbuild:
+    platforms:
+        - linux/amd64
+        - linux/386
+        - linux/arm
+        - linux/arm64
+        - linux/mips
+        - linux/mipsle
+        - linux/mips64
+        - linux/mips64le
+        - linux/ppc64
+        - linux/ppc64le
+        - linux/s390x