CMake: Replace "else(condition)" with "else()", etc.

Bumped required CMake version to 2.8.

Thanks to the SDL/Emscripten porting team for this cleanup.

CMakeLists.txt

@@ -2,7 +2,7 @@ if(${CMAKE_SOURCE_DIR} STREQUAL ${CMAKE_BINARY_DIR})
   message(FATAL_ERROR "Prevented in-tree built. Please create a build directory outside of the SDL source code and call cmake from there")
 endif()
 
-cmake_minimum_required(VERSION 2.6)
+cmake_minimum_required(VERSION 2.8)
 project(SDL2 C)
 include(CheckFunctionExists)
 include(CheckLibraryExists)
@@ -144,7 +144,7 @@ if("$ENV{CFLAGS}" STREQUAL "")
   if(USE_GCC OR USE_CLANG)
     set(CMAKE_C_FLAGS "-g -O3")
   endif()
-else("$ENV{CFLAGS}" STREQUAL "")
+else()
   set(CMAKE_C_FLAGS "$ENV{CFLAGS}")
   list(APPEND EXTRA_CFLAGS "$ENV{CFLAGS}")
 endif()
@@ -161,7 +161,7 @@ if(MSVC)
       if(${flag_var} MATCHES "/MD")
         string(REGEX REPLACE "/MD" "/MT" ${flag_var} "${${flag_var}}")
       endif()
-    endforeach(flag_var)
+    endforeach()
   endif()
 endif()
 
@@ -486,7 +486,7 @@ if(ASSEMBLY)
     set(SDL_ASSEMBLY_ROUTINES 1)
   endif()
 # TODO:
-#else(ASSEMBLY)
+#else()
 #  if(USE_GCC OR USE_CLANG)
 #    list(APPEND EXTRA_CFLAGS "-mno-sse" "-mno-sse2" "-mno-mmx")
 #  endif()
@@ -518,7 +518,7 @@ if(LIBC)
     set(HAVE_M_PI 1)
     add_definitions(-D_USE_MATH_DEFINES) # needed for M_PI
     set(STDC_HEADERS 1)
-  else(WINDOWS AND NOT MINGW)
+  else()
     set(HAVE_LIBC TRUE)
     check_include_file(sys/types.h HAVE_SYS_TYPES_H)
     foreach(_HEADER
@@ -571,7 +571,7 @@ if(LIBC)
 
     check_struct_has_member("struct sigaction" "sa_sigaction" "signal.h" HAVE_SA_SIGACTION)
   endif()
-else(LIBC)
+else()
   if(WINDOWS)
     set(HAVE_STDARG_H 1)
     set(HAVE_STDDEF_H 1)
@@ -752,7 +752,7 @@ if(UNIX AND NOT APPLE)
     if(FOUND_CLOCK_GETTIME)
       list(APPEND EXTRA_LIBS rt)
       set(HAVE_CLOCK_GETTIME 1)
-    else(FOUND_CLOCK_GETTIME)
+    else()
       check_library_exists(c clock_gettime "" FOUND_CLOCK_GETTIME)
       if(FOUND_CLOCK_GETTIME)
         set(HAVE_CLOCK_GETTIME 1)
@@ -1193,14 +1193,14 @@ if(NOT WINDOWS OR CYGWIN)
   if(SDL_STATIC)
     set(ENABLE_STATIC_TRUE "")
     set(ENABLE_STATIC_FALSE "#")
-  else(SDL_STATIC)
+  else()
     set(ENABLE_STATIC_TRUE "#")
     set(ENABLE_STATIC_FALSE "")
   endif()
   if(SDL_SHARED)
     set(ENABLE_SHARED_TRUE "")
     set(ENABLE_SHARED_FALSE "#")
-  else(SDL_SHARED)
+  else()
     set(ENABLE_SHARED_TRUE "#")
     set(ENABLE_SHARED_FALSE "")
   endif()
@@ -1281,7 +1281,7 @@ if(SDL_SHARED)
       VERSION ${LT_VERSION}
       SOVERSION ${LT_REVISION}
       OUTPUT_NAME "SDL2-${LT_RELEASE}")
-  else(UNIX)
+  else()
     set_target_properties(SDL2 PROPERTIES
       VERSION ${SDL_VERSION}
       SOVERSION ${LT_REVISION}
@@ -1330,7 +1330,7 @@ if(NOT WINDOWS OR CYGWIN)
   if(FREEBSD)
     # FreeBSD uses ${PREFIX}/libdata/pkgconfig
     install(FILES ${SDL2_BINARY_DIR}/sdl2.pc DESTINATION "libdata/pkgconfig")
-  else(FREEBSD)
+  else()
     install(FILES ${SDL2_BINARY_DIR}/sdl2.pc
       DESTINATION "lib${LIB_SUFFIX}/pkgconfig")
   endif()