Allow the Thrift compiler to be built without the XSD generator.

- Use AX_THRIFT_GEN to make configure support --disable-gen-xsd
- Update the compiler Makefile.am to exclude the generator.


git-svn-id: https://svn.apache.org/repos/asf/incubator/thrift/trunk@745236 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/compiler/cpp/Makefile.am b/compiler/cpp/Makefile.am
index fe2a2d7..4fc4637 100644
--- a/compiler/cpp/Makefile.am
+++ b/compiler/cpp/Makefile.am
@@ -11,7 +11,6 @@
                  src/md5.c \
                  src/generate/t_generator.cc \
                  src/generate/t_php_generator.cc \
-                 src/generate/t_xsd_generator.cc \
                  src/globals.h \
                  src/main.h \
                  src/platform.h \
@@ -71,6 +70,9 @@
 if THRIFT_GEN_hs
 thrift_SOURCES += src/generate/t_hs_generator.cc
 endif
+if THRIFT_GEN_xsd
+thrift_SOURCES += src/generate/t_xsd_generator.cc
+endif
 if THRIFT_GEN_html
 thrift_SOURCES += src/generate/t_html_generator.cc
 endif