cmake: Set CMAKE_INSTALL_PREFIX to "" so loader will be built with sys paths
CMake seems to default to non-null but for system SDK builds want this to
be empty string.
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 442876a..fd594c2 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -16,6 +16,8 @@
include(FindPkgConfig)
+set (CMAKE_INSTALL_PREFIX "")
+
if (CMAKE_COMPILER_IS_GNUCC OR CMAKE_C_COMPILER_ID MATCHES "Clang")
set(COMMON_COMPILE_FLAGS "-Wall -Wextra -Wno-unused-parameter -Wno-missing-field-initializers")
set(COMMON_COMPILE_FLAGS "${COMMON_COMPILE_FLAGS} -fno-strict-aliasing -fno-builtin-memcmp")