Fix shared build on Solaris

Author: vedranmiletic

CMakeLists.txt

@@ -185,7 +185,7 @@ set_target_properties(fmt PROPERTIES
   DEBUG_POSTFIX d)
 
 if (BUILD_SHARED_LIBS)
-  if (UNIX AND NOT APPLE)
+  if (UNIX AND NOT APPLE AND NOT ${CMAKE_SYSTEM_NAME} MATCHES "SunOS")
     # Fix rpmlint warning:
     # unused-direct-shlib-dependency /usr/lib/libformat.so.1.1.0 /lib/libm.so.6.
     target_link_libraries(fmt -Wl,--as-needed)