regen_makefile.sh: set executable name explicitly

Set the executable name in each regen_makefile.sh explicitly with -e,
instead of having it set indirectly from the first .ttcn file. Make it
consistent by placing the name on top of each of these files.

Fix for warning:
ttcn3_makefilegen: warning: File `BSC_Tests.ttcn' was given more than once for the Makefile.

Related: OS#5252
Change-Id: I5ed03f8f3ed905483620dc7bae33b617bbb8507f
diff --git a/gbproxy/regen_makefile.sh b/gbproxy/regen_makefile.sh
index 5ec6689..78910a4 100755
--- a/gbproxy/regen_makefile.sh
+++ b/gbproxy/regen_makefile.sh
@@ -1,5 +1,7 @@
 #!/bin/bash
 
+NAME=GBProxy_Tests
+
 FILES="
 	*.ttcn
 	*.ttcnpp
@@ -30,6 +32,6 @@
 	-DUSE_MTP3_DISTRIBUTOR
 "
 
-../regen-makefile.sh GBProxy_Tests.ttcn $FILES
+../regen-makefile.sh -e $NAME $FILES
 
 sed -i -i 's/^LINUX_LIBS = -lxml2/LINUX_LIBS = -lxml2 -lsctp/' Makefile