BaseTools: Fix the bug to re-build uni file for Library

The root cause is Module's self.CanSkip() is before LibraryAutoGen,
then when a uni file of library is changed, Module's self.CanSkip() is
still true which cause the library is not regenerated.
This patch change Module's self.CanSkip() after LibraryAutoGen.

Fixes: https://bugzilla.tianocore.org/show_bug.cgi?id=759
Cc: Liming Gao <liming.gao@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Yonghong Zhu <yonghong.zhu@intel.com>
Reviewed-by: Liming Gao <liming.gao@intel.com>

BaseTools/Source/Python/AutoGen/AutoGen.py

@@ -4229,13 +4229,14 @@ class ModuleAutoGen(AutoGen):
 
         if self.IsMakeFileCreated:
             return
-        if self.CanSkip():
-            return
 
         if not self.IsLibrary and CreateLibraryMakeFile:
             for LibraryAutoGen in self.LibraryAutoGenList:
                 LibraryAutoGen.CreateMakeFile()
 
+        if self.CanSkip():
+            return
+
         if len(self.CustomMakefile) == 0:
             Makefile = GenMake.ModuleMakefile(self)
         else:
@@ -4263,8 +4264,6 @@ class ModuleAutoGen(AutoGen):
     def CreateCodeFile(self, CreateLibraryCodeFile=True):
         if self.IsCodeFileCreated:
             return
-        if self.CanSkip():
-            return
 
         # Need to generate PcdDatabase even PcdDriver is binarymodule
         if self.IsBinaryModule and self.PcdIsDriver != '':
@@ -4279,6 +4278,9 @@ class ModuleAutoGen(AutoGen):
             for LibraryAutoGen in self.LibraryAutoGenList:
                 LibraryAutoGen.CreateCodeFile()
 
+        if self.CanSkip():
+            return
+
         AutoGenList = []
         IgoredAutoGenList = []