cmake: Return back the DEFAULT_C_COMPILE_FLAGS

Accidentally removed in 1689b83d0f.

Reported in #185 by Peter Kästle

Signed-off-by: Jakub Jelen <jjelen@redhat.com>
Reviewed-by: Norbert Pocs <npocs@redhat.com>
(cherry picked from commit 3058549bf7)

src/CMakeLists.txt

@@ -348,6 +348,9 @@ endif (WITH_SYMBOL_VERSIONING AND HAVE_LD_VERSION_SCRIPT AND ABIMAP_FOUND)
 # This gets built as a static library, if -DBUILD_SHARED_LIBS=OFF is passed to
 # cmake.
 add_library(ssh ${libssh_SRCS})
+target_compile_options(ssh
+                       PRIVATE
+                           ${DEFAULT_C_COMPILE_FLAGS})
 if (CYGWIN)
     target_compile_definitions(ssh PRIVATE _GNU_SOURCE)
 endif ()
@@ -407,6 +410,9 @@ install(EXPORT libssh-config
 
 if (BUILD_STATIC_LIB)
   add_library(ssh-static STATIC ${libssh_SRCS})
+  target_compile_options(ssh-static
+                         PRIVATE
+                             ${DEFAULT_C_COMPILE_FLAGS})
   if (CYGWIN)
     target_compile_definitions(ssh-static PRIVATE _GNU_SOURCE)
   endif ()