Fix .gitignore for libstd_unicode move

Author: Clar Charr

.gitignore

@@ -74,13 +74,13 @@ __pycache__/
 /obj/
 /rt/
 /rustllvm/
-/src/libstd_unicode/DerivedCoreProperties.txt
-/src/libstd_unicode/DerivedNormalizationProps.txt
-/src/libstd_unicode/PropList.txt
-/src/libstd_unicode/ReadMe.txt
-/src/libstd_unicode/Scripts.txt
-/src/libstd_unicode/SpecialCasing.txt
-/src/libstd_unicode/UnicodeData.txt
+/src/libcore/unicode/DerivedCoreProperties.txt
+/src/libcore/unicode/DerivedNormalizationProps.txt
+/src/libcore/unicode/PropList.txt
+/src/libcore/unicode/ReadMe.txt
+/src/libcore/unicode/Scripts.txt
+/src/libcore/unicode/SpecialCasing.txt
+/src/libcore/unicode/UnicodeData.txt
 /stage[0-9]+/
 /target
 target/
@@ -105,4 +105,3 @@ version.texi
 /src/target/
 
 no_llvm_build
-