lineage: soong: Add var for linker shim libs

* To limit security exposure, we're forcing all devices
  to define shim libs with a TARGET_LD_SHIM_LIBS

Change-Id: Ic8722c42807429f2faa3546316c71c40533ce195
diff --git a/build/soong/android/variable.go b/build/soong/android/variable.go
index 221bf97..85f7dee 100644
--- a/build/soong/android/variable.go
+++ b/build/soong/android/variable.go
@@ -9,6 +9,9 @@
 	Uses_qcom_bsp_legacy struct {
 		Cppflags []string
 	}
+	Target_shim_libs struct {
+		Cppflags []string
+	}
 }
 
 type ProductVariables struct {
@@ -16,4 +19,5 @@
 	Specific_camera_parameter_library  *string `json:",omitempty"`
 	Needs_text_relocations  *bool `json:",omitempty"`
 	Uses_qcom_bsp_legacy  *bool `json:",omitempty"`
+	Target_shim_libs  *string `json:",omitempty"`
 }
diff --git a/build/soong/soong_config.mk b/build/soong/soong_config.mk
index b5e469c..9f86c62 100644
--- a/build/soong/soong_config.mk
+++ b/build/soong/soong_config.mk
@@ -7,6 +7,7 @@
 	echo '    "Uses_generic_camera_parameter_library": $(if $(TARGET_SPECIFIC_CAMERA_PARAMETER_LIBRARY),false,true),'; \
 	echo '    "Specific_camera_parameter_library": "$(TARGET_SPECIFIC_CAMERA_PARAMETER_LIBRARY)",'; \
 	echo '    "Needs_text_relocations": $(if $(filter true,$(TARGET_NEEDS_PLATFORM_TEXT_RELOCATIONS)),true,false),'; \
-	echo '    "Uses_qcom_bsp_legacy": $(if $(filter true,$(TARGET_USES_QCOM_BSP_LEGACY)),true,false)'; \
+	echo '    "Uses_qcom_bsp_legacy": $(if $(filter true,$(TARGET_USES_QCOM_BSP_LEGACY)),true,false),'; \
+	echo '    "Target_shim_libs": "$(TARGET_LD_SHIM_LIBS)"'; \
 	echo '},'; \
 	echo '') > $(SOONG_VARIABLES_TMP)