6903453: Zero build on ARM and IA-64

Summary: Correctly set uname on ARM, and correctly build fdlibm on IA-64
Reviewed-by: ohair

make/common/shared/Platform.gmk

@@ -165,6 +165,9 @@ ifeq ($(SYSTEM_UNAME), Linux)
                 sparc*) \
                     echo sparc \
                     ;; \
+                arm*) \
+                    echo arm \
+                    ;; \
                 *) \
                     echo $(mach) \
                     ;; \

src/share/native/java/lang/fdlibm/include/fdlibm.h

@@ -29,7 +29,7 @@
 #ifdef __NEWVALID       /* special setup for Sun test regime */
 #if defined(i386) || defined(i486) || \
         defined(intel) || defined(x86) || \
-        defined(i86pc) || defined(_M_IA64)
+        defined(i86pc) || defined(_M_IA64) || defined(ia64)
 #define _LITTLE_ENDIAN
 #endif
 #endif