Split CRC10 & 12 implementations into separate translation units

Separate translation units avoids  compiler generated CRC tables being
linked when not needed.

Also only compile once and add to wsjt_cxx library for later link
editing.

git-svn-id: svn+ssh://svn.code.sf.net/p/wsjt/wsjt/branches/wsjtx@7631 ab8295b8-cf94-4d9e-aec4-7959e3be5d79

lib/crc10.cpp

@@ -0,0 +1,24 @@
+#include <boost/crc.hpp>
+
+extern "C"
+{
+   short crc10 (unsigned char const * data, int length);
+   bool crc10_check (unsigned char const * data, int length);
+}
+
+namespace
+{
+  unsigned long constexpr truncated_polynomial = 0x08f;
+}
+
+// assumes CRC is last 16 bits of the data and is set to zero
+// caller should assign the returned CRC into the message in big endian byte order
+short crc10 (unsigned char const * data, int length)
+{
+    return boost::augmented_crc<10, truncated_polynomial> (data, length);
+}
+
+bool crc10_check (unsigned char const * data, int length)
+{
+   return !boost::augmented_crc<10, truncated_polynomial> (data, length);
+}