Fixes underlinking math lib in base/CMakeLists.txt
Bug: https://bugs.gentoo.org/9889
Upstream PR: https://github.com/greenbone/gvm-libs/pull/811

--- a/base/CMakeLists.txt
+++ b/base/CMakeLists.txt
@@ -37,6 +37,7 @@ set (HEADERS array.h credentials.h cvss.h drop_privileges.h hosts.h logging.h
 if (BUILD_STATIC)
   set (LIBGVM_BASE_NAME gvm_base_static)
   add_library (gvm_base_static STATIC ${FILES})
+  target_link_libraries(gvm_base_static m)
   set_target_properties (gvm_base_static PROPERTIES OUTPUT_NAME "gvm_base")
   set_target_properties (gvm_base_static PROPERTIES CLEAN_DIRECT_OUTPUT 1)
   set_target_properties (gvm_base_static PROPERTIES PUBLIC_HEADER "${HEADERS}")
@@ -51,7 +52,7 @@ if (BUILD_SHARED)
   set_target_properties (gvm_base_shared PROPERTIES VERSION "${CPACK_PACKAGE_VERSION}")
   set_target_properties (gvm_base_shared PROPERTIES PUBLIC_HEADER "${HEADERS}")
 
-  target_link_libraries (gvm_base_shared LINK_PRIVATE ${GLIB_LDFLAGS} ${LINKER_HARDENING_FLAGS} ${SENTRY_LDFLAGS})
+  target_link_libraries (gvm_base_shared LINK_PRIVATE ${GLIB_LDFLAGS} ${LINKER_HARDENING_FLAGS} ${SENTRY_LDFLAGS} m)
 endif (BUILD_SHARED)
 
 set (LIBGVM_BASE_NAME