Fix build issue when SLANG_EMBED_CORE_MODULE is OFF. (shader-slang#6243)

Author: csyonghe

source/slang-glsl-module/CMakeLists.txt

@@ -1,6 +1,7 @@
 #
 # Generate an embeddable glsl module
 #
+if (${SLANG_EMBED_CORE_MODULE})
 
 set(glsl_module_generated_header_dir ${CMAKE_CURRENT_BINARY_DIR})
 set(glsl_module_generated_header
@@ -37,3 +38,5 @@ slang_add_target(
     INCLUDE_DIRECTORIES_PRIVATE ${glsl_module_generated_header_dir}
     INSTALL
 )
+
+endif()

source/slangc/CMakeLists.txt

@@ -1,11 +1,17 @@
+if (SLANG_EMBED_CORE_MODULE)
+    set(SLANG_GLSL_MODULE_DEPENDENCY REQUIRES slang-glsl-module)
+else()
+    set(SLANG_GLSL_MODULE_DEPENDENCY )
+endif()
+
 if(SLANG_ENABLE_SLANGC)
     slang_add_target(
         .
         EXECUTABLE
         USE_FEWER_WARNINGS
         DEBUG_DIR ${slang_SOURCE_DIR}
         LINK_WITH_PRIVATE core slang Threads::Threads
-        REQUIRES slang-glsl-module
+        ${SLANG_GLSL_MODULE_DEPENDENCY}
         INSTALL
         EXPORT_SET_NAME SlangTargets
     )