Makefile.am: Only compile/link cppglue.cxx if --with-cplusplus is used

Bloats libbeecrypt for no use and breaks build on systems without a C++
compiler.

Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>
---
 Makefile.am |    7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

Index: beecrypt-4.2.1/Makefile.am
===================================================================
--- beecrypt-4.2.1.orig/Makefile.am
+++ beecrypt-4.2.1/Makefile.am
@@ -62,7 +62,12 @@
 
 lib_LTLIBRARIES = libbeecrypt.la
 
-libbeecrypt_la_SOURCES = aes.c base64.c beecrypt.c blockmode.c blockpad.c blowfish.c dhies.c dldp.c dlkp.c dlpk.c dlsvdp-dh.c dsa.c elgamal.c endianness.c entropy.c fips186.c hmac.c hmacmd5.c hmacsha1.c hmacsha224.c hmacsha256.c md4.c md5.c hmacsha384.c hmacsha512.c memchunk.c mp.c mpbarrett.c mpnumber.c mpprime.c mtprng.c pkcs1.c pkcs12.c ripemd128.c ripemd160.c ripemd256.c ripemd320.c rsa.c rsakp.c rsapk.c sha1.c sha224.c sha256.c sha384.c sha512.c sha2k32.c sha2k64.c timestamp.c cppglue.cxx
+libbeecrypt_la_SOURCES = aes.c base64.c beecrypt.c blockmode.c blockpad.c blowfish.c dhies.c dldp.c dlkp.c dlpk.c dlsvdp-dh.c dsa.c elgamal.c endianness.c entropy.c fips186.c hmac.c hmacmd5.c hmacsha1.c hmacsha224.c hmacsha256.c md4.c md5.c hmacsha384.c hmacsha512.c memchunk.c mp.c mpbarrett.c mpnumber.c mpprime.c mtprng.c pkcs1.c pkcs12.c ripemd128.c ripemd160.c ripemd256.c ripemd320.c rsa.c rsakp.c rsapk.c sha1.c sha224.c sha256.c sha384.c sha512.c sha2k32.c sha2k64.c timestamp.c
+
+if WITH_CPLUSPLUS
+libbeecrypt_la_SOURCES += cppglue.cxx
+endif
+
 libbeecrypt_la_DEPENDENCIES = $(BEECRYPT_OBJECTS)
 libbeecrypt_la_LIBADD = blowfishopt.lo mpopt.lo sha1opt.lo $(OPENMP_LIBS)
 libbeecrypt_la_LDFLAGS = -no-undefined -version-info $(LIBBEECRYPT_LT_CURRENT):$(LIBBEECRYPT_LT_REVISION):$(LIBBEECRYPT_LT_AGE)