Fixed sticking of incremental cache data when case of file path is changed.

Original commit: 959364aa77

jps/jps-plugin/testData/incremental/custom/projectPathCaseChanged/build.log

@@ -0,0 +1,7 @@
+Cleaning output files:
+out/production/module/_DefaultPackage$foo$*.class
+out/production/module/_DefaultPackage.class
+End of files
+Compiling files:
+src/foo.kt
+End of files

jps/jps-plugin/testData/incremental/custom/projectPathCaseChanged/foo.kt

@@ -0,0 +1,2 @@
+fun f() {
+}

jps/jps-plugin/testData/incremental/custom/projectPathCaseChanged/foo.kt.new

@@ -0,0 +1,2 @@
+fun f() {
+}