jenkins: per build, drop programs built "unintentionally"

Each of the jenkins-build-* scripts intends to build a specific set of
programs. While compiling dependencies, other programs may end up in
$prefix/bin. Drop those other binaries to reduce potential confusion.

Add arguments to the create_bin_tgz function: callers need to list exactly the
$prefix/bin/* binaries that should be tar'd. All others are first removed from
the prefix.

Adjust existing scripts to provide such binary names.

Change-Id: Ib1a00b2149453fedf9ece0460dd4d6e83f774d45
diff --git a/contrib/jenkins-build-osmo-pcu.sh b/contrib/jenkins-build-osmo-pcu.sh
index 7953875..4d4277f 100755
--- a/contrib/jenkins-build-osmo-pcu.sh
+++ b/contrib/jenkins-build-osmo-pcu.sh
@@ -7,4 +7,4 @@
 build_repo libosmocore --disable-pcsc --disable-doxygen
 build_repo osmo-pcu
 
-create_bin_tgz
+create_bin_tgz osmo-pcu