Remove unused rules in .gitignore and Makefile

.gitignore

 # /
 *.bak
-*.dylib
-*.inc
-*.o
-*.a
 *.orig
 *.rej
 *.sav
 *.swp
-*.d
 *.tmp
-*.ctmp
-*.rbtmp
 *~
 .DS_Store
 .ccmalloc
@@ -21,20 +14,3 @@ cscope.out
 /src/y.tab.c
 /bin
 /build
-/mrblib/mrblib.c
-/mrblib/*.*tmp
-/mrblib/mrblib.mrb
-/test/mrbtest
-/test/mrbtest.c
-/test/*.*tmp
-/test/mrubytest.*
-tools/mrbc/mrbc.mrb
-CMakeFiles
-CMakeCache.txt
-/mrbgems/generator
-/mrbgems/gem_init.c
-/mrbgems/g/Makefile
-/mrbgems/g/MakefileGemList
-/mrbgems/g/mrbgemtest.ctmp
-/mrbgems/g/mrbgemtest.rbtmp
-/mrbgems/g/*/gem_srclib.c

Makefile

@@ -16,6 +16,3 @@ test :
 clean :
 	$(RAKE) clean
 
-.PHONY : showconfig
-showconfig :
-	$(RAKE) showconfig

doc/mrbgems/c_and_ruby_extension_example/.gitignore

-# mrbgems
-*.d
-gem_init.c
-gem_test.c
-

doc/mrbgems/c_extension_example/.gitignore

-# mrbgems
-*.d
-gem_init.c
-gem_test.c
-

doc/mrbgems/ruby_extension_example/.gitignore

-# mrbgems
-*.d
-gem_init.c
-gem_test.c