git_helper: use GIT_ROOT as working directory and not the -C option of git to fix usage in Windows

cmake/git_helper.cmake

@@ -1,8 +1,10 @@
 # Execute git command and return the output
-Function ( GitExecute COMMAND FORCE OUT_RESULT OUT_SUCCESS )
+Function ( GitExecute GIT_ROOT COMMAND FORCE OUT_RESULT OUT_SUCCESS )
     Set ( ${OUT_SUCCESS} 1 PARENT_SCOPE )
     Execute_Process ( COMMAND
                         bash -c "${COMMAND}"
+                      WORKING_DIRECTORY
+                        "${GIT_ROOT}"
                       RESULT_VARIABLE
                         GIT_RET
                       OUTPUT_VARIABLE
@@ -28,17 +30,17 @@ Function ( GitGetVersion GIT_ROOT OUT_MAJOR OUT_MINOR OUT_PATCH OUT_BUILD OUT_HA
     EndIf ( )
 
     # Find the latest git tag
-    GitExecute ( "git -C ${GIT_ROOT} describe --tags --abbrev=1 --match v[0-9].[0-9]* HEAD" False TAG SUCCESS )
+    GitExecute ( "${GIT_ROOT}" "git describe --tags --abbrev=1 --match v[0-9].[0-9]* HEAD" False TAG SUCCESS )
     If ( NOT ${SUCCESS} )
         Return ( )
     EndIf ( )
 
-    GitExecute ( "git -C ${GIT_ROOT} status -s -uall" True DIRTY SUCCESS )
+    GitExecute ( "${GIT_ROOT}" "git status -s -uall" True DIRTY SUCCESS )
     If ( NOT ${SUCCESS} )
         Return ( )
     EndIf ( )
 
-    GitExecute ( "git -C ${GIT_ROOT} rev-parse HEAD" True HASH SUCCESS )
+    GitExecute ( "${GIT_ROOT}" "git rev-parse HEAD" True HASH SUCCESS )
     If ( NOT ${SUCCESS} )
         Return ( )
     EndIf ( )
@@ -108,7 +110,7 @@ Function ( GitGetHash GIT_ROOT OUT_HASH )
         Message ( FATAL_ERROR "${GIT_ROOT} is not a git directory" )
     EndIf ( )
 
-    GitExecute ( "git -C ${GIT_ROOT} rev-parse HEAD" True HASH SUCCESS )
+    GitExecute ( "${GIT_ROOT}" "git rev-parse HEAD" True HASH SUCCESS )
     If ( NOT ${SUCCESS} )
         Return ( )
     EndIf ( )
@@ -126,7 +128,7 @@ Function ( GitGetIsDirty GIT_ROOT OUT_DIRTY )
         Message ( FATAL_ERROR "${GIT_ROOT} is not a git directory" )
     EndIf ( )
 
-    GitExecute ( "git -C ${GIT_ROOT} status -s -uall" True DIRTY SUCCESS )
+    GitExecute ( "${GIT_ROOT}" "git status -s -uall" True DIRTY SUCCESS )
     If ( NOT ${SUCCESS} )
         Return ( )
     EndIf ( )