#1210 make build.path OS dependent path

Author: jantje

io.sloeber.core/config/pre_processing_platform_default.txt

@@ -8,7 +8,7 @@ runtime.ide.version=10812
 build.system.path=${referenced.core.path}${DirectoryDelimiter}system
 serial.port=${com_port}
 build.project_name=${ProjName}
-build.path=${ProjDirPath}${DirectoryDelimiter}${ConfigName}
+
 
 
 #quick fix for issue #810

io.sloeber.core/src/io/sloeber/core/api/SloeberProject.java

@@ -72,6 +72,7 @@ public class SloeberProject extends Common {
     private boolean myNeedsSyncWithCDT = false; // Knows CDT all configs Sloeber Knows
 
     private static final String ENV_KEY_BUILD_SOURCE_PATH = BUILD + DOT + SOURCE + DOT + PATH;
+    private static final String ENV_KEY_BUILD_PATH = BUILD + DOT + PATH;
     private static final String ENV_KEY_BUILD_GENERIC_PATH = BUILD + DOT + "generic" + DOT + PATH; //$NON-NLS-1$
     private static final String ENV_KEY_COMPILER_PATH = COMPILER + DOT + PATH;
     private static final String SLOEBER_MAKE_LOCATION = ENV_KEY_SLOEBER_START + "make_location"; //$NON-NLS-1$
@@ -350,6 +351,7 @@ private HashMap<String, String> getEnvVars(String configKey) {
         HashMap<String, String> allVars = new HashMap<>();
 
         allVars.put(ENV_KEY_BUILD_SOURCE_PATH, myProject.getLocation().toOSString());
+        allVars.put(ENV_KEY_BUILD_PATH, myProject.getLocation().append(configKey).toOSString());
 
         if (boardDescription != null) {
             allVars.putAll(boardDescription.getEnvVars());