Deal with ELF underscores on Solaris with Sun Studio.

Fixes Bugzilla #595.

--HG--
branch : SDL-1.2
extra : convert_revision : svn%3Ac70aab31-4412-0410-b14c-859654838e24/branches/SDL-1.2%403206

src/hermes/HeadMMX.h

@@ -46,7 +46,7 @@ void ConvertMMXp32_16RGB555();
 
 /* Fix the underscore business with ELF compilers */
 
-#if defined(__ELF__) && defined(__GNUC__)
+#if (defined(__ELF__) && defined(__GNUC__)) || defined(__SUNPRO_C)
   #ifdef __cplusplus 
   extern "C" {   
   #endif

src/hermes/HeadX86.h

@@ -74,7 +74,7 @@ extern int ConvertX86p16_32BGRA888_LUT_X86[512];
 
 /* Now fix up the ELF underscore problem */
 
-#if defined(__ELF__) && defined(__GNUC__)
+#if (defined(__ELF__) && defined(__GNUC__)) || defined(__SUNPRO_C)
   #ifdef __cplusplus
   extern "C" {
   #endif