Makefile.inc: use standard source header

# ./lib/Makefile.inc

# Using the backslash as line continuation character might be problematic

# with some make flavours, as Watcom's wmake showed us already. If we

# ever want to change this in a portable manner then we should consider

# this idea (posted to the libcurl list by Adam Kellas):

# CSRC1 = file1.c file2.c file3.c

# CSRC2 = file4.c file5.c file6.c

# CSOURCES = $(CSRC1) $(CSRC2)

#***************************************************************************

#                                  _   _ ____  _

#  Project                     ___| | | |  _ \| |

#                             / __| | | | |_) | |

#                            | (__| |_| |  _ <| |___

#                             \___|\___/|_| \_\_____|

#

# Copyright (C) 1998 - 2013, Daniel Stenberg, <daniel@haxx.se>, et al.

#

# This software is licensed as described in the file COPYING, which

# you should have received as part of this distribution. The terms

# are also available at http://curl.haxx.se/docs/copyright.html.

#

# You may opt to use, copy, modify, merge, publish, distribute and/or sell

# copies of the Software, and permit persons to whom the Software is

# furnished to do so, under the terms of the COPYING file.

#

# This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY

# KIND, either express or implied.

#

###########################################################################

VSOURCES=vtls/openssl.c vtls/gtls.c vtls/vtls.c vtls/nss.c vtls/qssl.c	\

  vtls/polarssl.c vtls/polarssl_threadlock.c vtls/axtls.c vtls/cyassl.c	\