cmake: clean up if auto-dereferencing

CMake will auto-dereference variable names in if statements, so there's
no need to dereference them manually.

CMakeLists.txt

@@ -48,7 +48,7 @@ set (CMAKE_MODULE_PATH "${CMAKE_SOURCE_DIR}/cmake")
 if (NOT DEFINED ENV{DEVELOPER_LOCAL_TOOLS})
 	message(STATUS "Could not find DEVELOPER_LOCAL_TOOLS in env (not required)")
 	set(BOOST_IGNORE_SYSTEM_PATHS_DEFAULT OFF)
-elseif ("$ENV{DEVELOPER_LOCAL_TOOLS}" EQUAL 1)
+elseif (ENV{DEVELOPER_LOCAL_TOOLS} EQUAL 1)
 	message(STATUS "Found: env DEVELOPER_LOCAL_TOOLS = 1")
 	set(BOOST_IGNORE_SYSTEM_PATHS_DEFAULT ON)
 else()
@@ -130,7 +130,7 @@ if(MSVC)
   include_directories(SYSTEM src/platform/msc)
 else()
   set(ARCH native CACHE STRING "CPU to build for: -march value or default")
-  if("${ARCH}" STREQUAL "default")
+  if(ARCH STREQUAL "default")
     set(ARCH_FLAG "")
   else()
     set(ARCH_FLAG "-march=${ARCH}")
@@ -212,7 +212,7 @@ if(NOT Boost_FOUND)
   die("Could not find Boost libraries, please make sure you have installed Boost or libboost-all-dev (1.53 or 1.55+) or the equivalent")
 endif()
 
-if((${Boost_MAJOR_VERSION} EQUAL 1) AND (${Boost_MINOR_VERSION} EQUAL 54))
+if((Boost_MAJOR_VERSION EQUAL 1) AND (Boost_MINOR_VERSION EQUAL 54))
   die("Boost version 1.54 is unsupported due to a bug (see: http://goo.gl/RrCFmA), please install Boost 1.53 or 1.55 and above")
 endif()
 

src/version.cmake

@@ -68,7 +68,7 @@ else()
 			message(STATUS "The most recent tag was at ${TAGGEDCOMMIT}")
 			
 			# Check if we're building that tagged commit or a different one
-			if(${COMMIT} MATCHES ${TAGGEDCOMMIT})
+			if(COMMIT MATCHES TAGGEDCOMMIT)
 				message(STATUS "You are building a tagged release")
 				set(VERSIONTAG "release")
 			else()