Move devlib packages into "general"

The removal of the wheel caching code
(Ia140dc34638d893b92f66d1ba20efd9522c5923b) removed the install of the
"devlib" packages, which was being done with a call in
tools/build_wheels.sh

The idea of "devlibs" and "general" seems to be pretty much the same
thing -- global build requirements.  I have removed the unused devlibs
files, and moved any missing packages into the "general" package
install file.

Change-Id: I8f34a164d6785a122394b42387d4221a7b447ae1
diff --git a/files/rpms-suse/general b/files/rpms-suse/general
index 42756d8..3a7c4b5 100644
--- a/files/rpms-suse/general
+++ b/files/rpms-suse/general
@@ -21,3 +21,8 @@
 unzip
 wget
 net-tools
+libffi-devel  # pyOpenSSL
+libxslt-devel  # lxml
+postgresql-devel  # psycopg2
+libmysqlclient-devel # MySQL-python
+python-devel  # pyOpenSSL