Merged in lindenlab/viewer64-callum (pull request #15)

Expand the way we set C++ flags in cmake to call out each build type explicitly

Approved-by: nat_linden <nat@lindenlab.com>

indra/cmake/00-Common.cmake

@@ -19,7 +19,9 @@ set(${CMAKE_CURRENT_LIST_FILE}_INCLUDED "YES")
 include(Variables)
 
 # We go to some trouble to set LL_BUILD to the set of relevant compiler flags.
-set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} $ENV{LL_BUILD}")
+set(CMAKE_CXX_FLAGS_RELEASE "$ENV{LL_BUILD_RELEASE}")
+set(CMAKE_CXX_FLAGS_RELWITHDEBINFO "$ENV{LL_BUILD_RELWITHDEBINFO}")
+set(CMAKE_CXX_FLAGS_DEBUG "$ENV{LL_BUILD_DEBUG}")
 # Given that, all the flags you see added below are flags NOT present in
 # https://bitbucket.org/lindenlab/viewer-build-variables/src/tip/variables.
 # Before adding new ones here, it's important to ask: can this flag really be