Only load a dependent library when it has an expected symbol.

Bug 18752589

Change-Id: Ic42be261dc101810e6363c4823620d6c827c7975
Reviewed-on: https://swiftshader-review.googlesource.com/2880
Tested-by: Nicolas Capens <capn@google.com>
Reviewed-by: Alexis Hétu <sugoi@google.com>
Reviewed-by: Nicolas Capens <capn@google.com>

src/OpenGL/libGLES_CM/libGLES_CM.hpp

diff --git a/src/OpenGL/libGLES_CM/libGLES_CM.hpp b/src/OpenGL/libGLES_CM/libGLES_CM.hpp
index dd2d23a..300140d 100644
--- a/src/OpenGL/libGLES_CM/libGLES_CM.hpp
+++ b/src/OpenGL/libGLES_CM/libGLES_CM.hpp
@@ -76,12 +76,12 @@
 			const char *libGLES_CM_lib[] = {"libGLES_CM_translator.so", "libGLES_CM.so.1", "libGLES_CM.so"};
 			#endif
 
-			libGLES_CM = loadLibrary(libGLES_CM_lib);
+			libGLES_CM = loadLibrary(libGLES_CM_lib, "libGLES_CM_swiftshader");
 
 			if(libGLES_CM)
 			{
-				auto libGLES_CMexportsProc = (LibGLES_CMexports *(*)())getProcAddress(libGLES_CM, "libGLES_CMexports");
-				libGLES_CMexports = libGLES_CMexportsProc();
+				auto libGLES_CM_swiftshader = (LibGLES_CMexports *(*)())getProcAddress(libGLES_CM, "libGLES_CM_swiftshader");
+				libGLES_CMexports = libGLES_CM_swiftshader();
 			}
 		}