[master] 04e1c1744 vmodtool: support only one input file

[Dridi Boukelmoune]

commit 04e1c1744893c1765c8e3fe1b46e9b4953241300
Author: Dridi Boukelmoune <dridi.boukelmoune at gmail.com>
Date:   Tue May 19 12:10:32 2020 +0200

    vmodtool: support only one input file
    
    That is, in the context of varnish.m4, because this changes existing
    behavior in a way that breaks backward compatibility.
    
    Partial revert of 134d063337b6f9b4260ec56feec552807c7fd090.

diff --git a/varnish.m4 b/varnish.m4
index 788dd3973..2ede52bfc 100644
--- a/varnish.m4
+++ b/varnish.m4
@@ -210,8 +210,7 @@ vmod_$1.lo: \$(nodist_libvmod_$1_la_SOURCES)
 vcc_$1_if.h vmod_$1.rst vmod_$1.man.rst: vcc_$1_if.c
 
 vcc_$1_if.c: vmod_$1.vcc
-	\$(A""M_V_VMODTOOL) \$(PYTHON) \$(VMODTOOL) -o vcc_$1_if \\
-	  \$(builddir)/vmod_$1.vcc \$(srcdir)/vmod_$1.vcc
+	\$(A""M_V_VMODTOOL) \$(PYTHON) \$(VMODTOOL) -o vcc_$1_if \$(srcdir)/vmod_$1.vcc
 
 vmod_$1.3: vmod_$1.man.rst
 	\$(A""M_V_GEN) \$(RST2MAN) vmod_$1.man.rst vmod_$1.3