Missing header in utils/thread.c

Caused crash in macOS because of implicit function declaration.

+ added -Werror for this warning

Makefile.in

@@ -5,7 +5,7 @@ CC            = @CC@
 CXX           = @CXX@
 QMAKE         = @QMAKE@
 LINKER        = @LINKER@
-COMMON_FLAGS  = @COMMON_FLAGS@ -g @DEFS@ -DPATH_PREFIX='"@prefix@"' -DLIB_DIR='"@libdir@"' -Wall -Wextra -Wpointer-arith -DGF_BITS=16
+COMMON_FLAGS  = @COMMON_FLAGS@ -g @DEFS@ -DPATH_PREFIX='"@prefix@"' -DLIB_DIR='"@libdir@"' -Wall -Wextra -Wpointer-arith -Werror=implicit-function-declaration -DGF_BITS=16
 CFLAGS        = @CFLAGS@ @X_CFLAGS@ $(COMMON_FLAGS) -D_GNU_SOURCE
 CPPFLAGS      = @CPPFLAGS@ -D_GNU_SOURCE
 CXXFLAGS      = @CXXFLAGS@ $(COMMON_FLAGS) -D_GNU_SOURCE

src/utils/thread.c

@@ -44,6 +44,9 @@
 #ifdef HAVE_SETTHREADDESCRIPTION
 #include <processthreadsapi.h>
 #endif
+#ifndef WIN32
+#include <libgen.h>
+#endif
 
 #include "host.h"
 #include "utils/thread.h"