Detect Borland compiler version with its id

Decode hex digits from __BORLANDC__ to compute the version number
components.  Note that the constant encodes decimal digits as hex digits
(never larger than 9).  We represent them as decimal after extraction.
See documentation at

  http://predef.sourceforge.net/precomp.html
  http://docwiki.embarcadero.com/RADStudio/en/Predefined_Macros

Modules/CMakeCCompilerId.c.in

@@ -20,6 +20,8 @@
 
 #elif defined(__BORLANDC__)
 # define COMPILER_ID "Borland"
+# define COMPILER_VERSION_MAJOR HEX(__BORLANDC__>>8)
+# define COMPILER_VERSION_MINOR HEX(__BORLANDC__ & 0xFF)
 
 #elif defined(__WATCOMC__)
 # define COMPILER_ID "Watcom"

Modules/CMakeCXXCompilerId.cpp.in

@@ -22,6 +22,8 @@
 
 #elif defined(__BORLANDC__)
 # define COMPILER_ID "Borland"
+# define COMPILER_VERSION_MAJOR HEX(__BORLANDC__>>8)
+# define COMPILER_VERSION_MINOR HEX(__BORLANDC__ & 0xFF)
 
 #elif defined(__WATCOMC__)
 # define COMPILER_ID "Watcom"