Rename X86-64_API -> X86_64_API

automake doesn't allow hyphens in variable names

Signed-off-by: Jon TURNEY <jon.turney@dronecode.org.uk>
Reviewed-by: Eric Anholt <eric@anholt.net>
Tested-by: Matt Turner <mattst88@gmail.com>

configure.ac

@@ -509,7 +509,7 @@ if test "x$enable_asm" = xyes; then
     x86_64)
         DEFINES="$DEFINES -DUSE_X86_64_ASM"
         MESA_ASM_FILES='$(X86_64_FILES)'
-        GLAPI_ASM_SOURCES='$(X86-64_API)'
+        GLAPI_ASM_SOURCES='$(X86_64_API)'
         AC_MSG_RESULT([yes, x86_64])
         ;;
     sparc)

src/mapi/glapi/sources.mak

@@ -12,7 +12,7 @@ GLAPI_SOURCES = \
 X86_API =			\
 	glapi_x86.S
 
-X86-64_API =			\
+X86_64_API =			\
 	glapi_x86-64.S
 
 SPARC_API =			\