ispc: fix CMAKE_BUILD_TYPE=None

srcpkgs/ispc/patches/cmake-build-type-none.patch

@@ -0,0 +1,18 @@
+Index: ispc-1.15.0/CMakeLists.txt
+===================================================================
+--- ispc-1.15.0.orig/CMakeLists.txt
++++ ispc-1.15.0/CMakeLists.txt
+@@ -157,13 +157,6 @@ set(OUTPUT_RELEASE Release/bin)
+ set(CMAKE_RUNTIME_OUTPUT_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}/bin )
+ 
+ if(CMAKE_BUILD_TYPE)
+-    # Validate build type
+-    set(CONFIGURATION_TYPES "Debug;Release;RelWithDebInfo")
+-
+-    string(FIND "${CONFIGURATION_TYPES}" "${CMAKE_BUILD_TYPE}" MATCHED_CONFIG)
+-    if (${MATCHED_CONFIG} EQUAL -1)
+-         message(FATAL_ERROR "CMAKE_BUILD_TYPE (${CMAKE_BUILD_TYPE}) allows only the following values: ${CONFIGURATION_TYPES}")
+-    endif()
+ else(NOT CMAKE_BUILD_TYPE)
+     set(CMAKE_BUILD_TYPE "Release")
+     message(STATUS "Build type not specified: Use Release by default.")