[PATCH bpf-next] libbpf: Fix libbpf_common.h when installing libbpf through 'make install'

["Toke Høiland-Jørgensen" <toke@redhat.com>]

This fixes two issues with the newly introduced libbpf_common.h file:

- The header failed to include <string.h> for the definition of memset()
- The new file was not included in the install_headers rule in the Makefile

Both of these issues cause breakage when installing libbpf with 'make
install' and trying to use it in applications.

Fixes: 544402d4b493 ("libbpf: Extract common user-facing helpers")
Signed-off-by: Toke Høiland-Jørgensen <toke@redhat.com>
---
 tools/lib/bpf/Makefile        | 1 +
 tools/lib/bpf/libbpf_common.h | 2 ++
 2 files changed, 3 insertions(+)

diff --git a/tools/lib/bpf/Makefile b/tools/lib/bpf/Makefile
index a3718cb275f2..d4790121adf4 100644
--- a/tools/lib/bpf/Makefile
+++ b/tools/lib/bpf/Makefile
@@ -251,6 +251,7 @@ install_headers: bpf_helper_defs.h
 		$(call do_install,libbpf.h,$(prefix)/include/bpf,644); \
 		$(call do_install,btf.h,$(prefix)/include/bpf,644); \
 		$(call do_install,libbpf_util.h,$(prefix)/include/bpf,644); \
+		$(call do_install,libbpf_common.h,$(prefix)/include/bpf,644); \
 		$(call do_install,xsk.h,$(prefix)/include/bpf,644); \
 		$(call do_install,bpf_helpers.h,$(prefix)/include/bpf,644); \
 		$(call do_install,bpf_helper_defs.h,$(prefix)/include/bpf,644); \
diff --git a/tools/lib/bpf/libbpf_common.h b/tools/lib/bpf/libbpf_common.h
index 4fb833840961..a23ae1ac27eb 100644
--- a/tools/lib/bpf/libbpf_common.h
+++ b/tools/lib/bpf/libbpf_common.h
@@ -9,6 +9,8 @@
 #ifndef __LIBBPF_LIBBPF_COMMON_H
 #define __LIBBPF_LIBBPF_COMMON_H
 
+#include <string.h>
+
 #ifndef LIBBPF_API
 #define LIBBPF_API __attribute__((visibility("default")))
 #endif
-- 
2.24.1