fix to build with Intel compiler

[glennpj]

Currently, graphite2 does not build with the Intel compiler due to the REGPARM definition. The following patch will get it to build.

index b23819f..0f75ae8 100644
--- a/src/inc/Machine.h
+++ b/src/inc/Machine.h
@@ -46,7 +46,7 @@ of the License or (at your option) any later version.
 #endif
 #else
 #define     HOT             __attribute__((hot))
-#if defined(__x86_64)
+#if defined(__x86_64) && !defined(__INTEL_COMPILER)
 #define     REGPARM(n)      __attribute__((hot, regparm(n)))
 #else
 #define     REGPARM(n)

[mgood7123]

applied in #69