Use 'with open(file) as f:' to avoid 'ResourceWarning: unclosed file'

Removes 220 warnings from build log (at least under Windows).
Requires Python 2.5+

Change-Id: I06b18b14a08f2c27528fcb009faddff081ffd54e
Reviewed-on: https://gerrit.libreoffice.org/29172Reviewed-by: Michael Stahl <mstahl@redhat.com>
Tested-by: Mike Kaganski <mike.kaganski@collabora.com>

solenv/gbuild/gen-autoinstall.py

@@ -18,11 +18,17 @@ scp2componentcondition = sys.argv[2]
 scp2libtemplate = sys.argv[3]
 scp2exetemplate = sys.argv[4]
 scp2jartemplate = sys.argv[5]
-sdklibs = open(sys.argv[6]).readline().split()
-libs = open(sys.argv[7]).readline().split()
-exes = open(sys.argv[8]).readline().split()
-jars = open(sys.argv[9]).readline().split()
-pkgs = open(sys.argv[10]).readline().split()
+# use 'with open(file) as f:' to avoid 'ResourceWarning: unclosed file'
+with open(sys.argv[6]) as f:
+    sdklibs = f.readline().split()
+with open(sys.argv[7]) as f:
+    libs = f.readline().split()
+with open(sys.argv[8]) as f:
+    exes = f.readline().split()
+with open(sys.argv[9]) as f:
+    jars = f.readline().split()
+with open(sys.argv[10]) as f:
+    pkgs = f.readline().split()
 
 if len(scp2componentcondition) > 0:
     scp2componentcondition = "," + scp2componentcondition