make uninteresting code in clang's makefile to the uninteresting part

Change-Id: I235284c7198aa2a295b4d81ff2f8e9ca554a4174
Reviewed-on: https://gerrit.libreoffice.org/67971
Tested-by: Jenkins
Reviewed-by: Luboš Luňák <l.lunak@collabora.com>

compilerplugins/Makefile-clang.mk

@@ -8,16 +8,6 @@
 
 # Make sure variables in this Makefile do not conflict with other variables (e.g. from gbuild).
 
-CLANG_COMMA :=,
-
-ifeq ($(OS),WNT)
-CLANG_DL_EXT = .dll
-CLANG_EXE_EXT = .exe
-else
-CLANG_DL_EXT = .so
-CLANG_EXE_EXT =
-endif
-
 # Compile flags ('make CLANGCXXFLAGS=-g' if you need to debug the plugin); you
 # may occasionally want to override these:
 ifeq ($(OS),WNT)
@@ -34,6 +24,16 @@ endif
 
 # The uninteresting rest.
 
+CLANG_COMMA :=,
+
+ifeq ($(OS),WNT)
+CLANG_DL_EXT = .dll
+CLANG_EXE_EXT = .exe
+else
+CLANG_DL_EXT = .so
+CLANG_EXE_EXT =
+endif
+
 # Clang headers require these.
 CLANGDEFS=-D__STDC_CONSTANT_MACROS -D__STDC_FORMAT_MACROS -D__STDC_LIMIT_MACROS
 ifneq ($(OS),WNT)