Revert "Merge "Switch the required host Java environment to 1.6." into kraken"

This reverts commit 1f29d2c376295cb7ba909ae2beb4904099546e89, reversing
changes made to f9f513ab3386e0ab61cb072170b4b65f0d124732.
diff --git a/core/main.mk b/core/main.mk
index b8c290a..ea8b66b 100644
--- a/core/main.mk
+++ b/core/main.mk
@@ -101,38 +101,43 @@
 endif
 
 
+# The windows build server currently uses 1.6.  This will be fixed.
+ifneq ($(HOST_OS),windows)
+
 # Check for the correct version of java
-java_version := $(shell java -version 2>&1 | head -n 1 | grep '[ "]1\.6[\. "$$]')
+java_version := $(shell java -version 2>&1 | head -n 1 | grep '[ "]1\.5[\. "$$]')
 ifeq ($(strip $(java_version)),)
 $(info ************************************************************)
 $(info You are attempting to build with the incorrect version)
 $(info of java.)
 $(info $(space))
 $(info Your version is: $(shell java -version 2>&1 | head -n 1).)
-$(info The correct version is: 1.6.)
+$(info The correct version is: 1.5.)
 $(info $(space))
 $(info Please follow the machine setup instructions at)
 $(info $(space)$(space)$(space)$(space)http://source.android.com/download)
 $(info ************************************************************)
-$(error stop)
+#$(error stop)
 endif
 
 # Check for the correct version of javac
-javac_version := $(shell javac -version 2>&1 | head -n 1 | grep '[ "]1\.6[\. "$$]')
+javac_version := $(shell javac -version 2>&1 | head -n 1 | grep '[ "]1\.5[\. "$$]')
 ifeq ($(strip $(javac_version)),)
 $(info ************************************************************)
 $(info You are attempting to build with the incorrect version)
 $(info of javac.)
 $(info $(space))
 $(info Your version is: $(shell javac -version 2>&1 | head -n 1).)
-$(info The correct version is: 1.6.)
+$(info The correct version is: 1.5.)
 $(info $(space))
 $(info Please follow the machine setup instructions at)
 $(info $(space)$(space)$(space)$(space)http://source.android.com/download)
 $(info ************************************************************)
-$(error stop)
+#$(error stop)
 endif
 
+endif # windows
+
 $(shell echo 'VERSIONS_CHECKED := $(VERSION_CHECK_SEQUENCE_NUMBER)' \
         > $(OUT_DIR)/versions_checked.mk)
 endif