Fix SPARC assembly for 64-bit

- The test for whether or not we're building for 64-bit is '#ifdef __arch64__'.
 This appears to be correct on both Linux and Solaris.

- The test for Solaris is now '#if defined(SVR4) || defined(__SVR4) ||
defined(__svr4__)'.  GCC 3.4.0 has all three defined on Solaris 9.

- Enables assembly language clip routines.

- Fixes to make GLSL code build on Solaris.

- Update gl_SPARC_asm.py.

src/mesa/glapi/glapi.c

@@ -711,7 +711,7 @@ generate_entrypoint(GLuint functionOffset)
    return (_glapi_proc) code;
 #elif defined(USE_SPARC_ASM)
 
-#if (defined(__sparc_v9__) && (!defined(__linux__) || defined(__linux_sparc_64__)))
+#ifdef __arch64__
    static const unsigned int insn_template[] = {
 	   0x05000000,	/* sethi	%uhi(_glapi_Dispatch), %g2	*/
 	   0x03000000,	/* sethi	%hi(_glapi_Dispatch), %g1	*/
@@ -739,7 +739,7 @@ generate_entrypoint(GLuint functionOffset)
    if (code) {
       memcpy(code, insn_template, sizeof(insn_template));
 
-#if (defined(__sparc_v9__) && (!defined(__linux__) || defined(__linux_sparc_64__)))
+#ifdef __arch64__
       code[0] |= (glapi_addr >> (32 + 10));
       code[1] |= ((glapi_addr & 0xffffffff) >> 10);
       __glapi_sparc_icache_flush(&code[0]);
@@ -791,17 +791,17 @@ fill_in_entrypoint_offset(_glapi_proc entrypoint, GLuint offset)
 
    /* XXX this hasn't been tested! */
    unsigned int *code = (unsigned int *) entrypoint;
-#if (defined(__sparc_v9__) && (!defined(__linux__) || defined(__linux_sparc_64__)))
+#ifdef __arch64__
    code[6] = 0x05000000;  /* sethi	%hi(8 * glapioffset), %g2	*/
    code[7] = 0x8410a000;  /* or		%g2, %lo(8 * glapioffset), %g2	*/
    code[6] |= ((offset * 8) >> 10);
    code[7] |= ((offset * 8) & ((1 << 10) - 1));
    __glapi_sparc_icache_flush(&code[6]);
-#else /* __sparc_v9__ && !linux */
+#else /* __arch64__ */
    code[2] = 0xc6006000;  /* ld		[%g1 + %lo(4*glapioffset)], %g3	  */
    code[2] |= (offset * 4);
    __glapi_sparc_icache_flush(&code[2]);
-#endif /* __sparc_v9__ && !linux */
+#endif /* __arch64__ */
 
 #else