Remove some autotools relics from .gitignore

.gitignore

@@ -1,4 +1,3 @@
-autom4te.cache
 *~
 *.bak
 .deps
@@ -7,28 +6,15 @@ deps
 /openclonk
 /c4group
 /c4script
-.dirstamp
 *.a
 *.c4p
 planet/Records.c4f
 *.lib
 *.dll
-stamp-h1
 config.h
-config.log
-config.status
 C4Version.h
 Makefile
 C4Include.h.gch
-Makefile.in
-aclocal.m4
-autotools/config.guess
-autotools/config.sub
-autotools/compile
-autotools/depcomp
-autotools/install-sh
-autotools/missing
-configure
 intermediate
 build*
 CMakeScripts