[openwrt/openwrt] libmnl: fix build when bash is not located at /bin/bash

[LEDE Commits]

chunkeey pushed a commit to openwrt/openwrt.git, branch openwrt-22.03:
https://git.openwrt.org/daa73dc681455bc2daa83d76f158f4977d9283e4

commit daa73dc681455bc2daa83d76f158f4977d9283e4
Author: Mark Mentovai <mark at mentovai.com>
AuthorDate: Sun Jul 10 19:43:05 2022 -0400

    libmnl: fix build when bash is not located at /bin/bash
    
    This fixes the libmnl build on macOS, which ships with an outdated bash
    at /bin/bash. During the OpenWrt build, a modern host bash is built and
    made available at staging_dir/host/bin/bash, which is present before
    /bin/bash in the build's PATH.
    
    This is similar to 8f7ce3aa6dda, presently appearing at
    package/kernel/mac80211/patches/build/001-fix_build.patch.
    
    Signed-off-by: Mark Mentovai <mark at mentovai.com>
    (cherry picked from commit beeb49740bb4f68aadf92095984a2d1f9a488956)
---
 package/libs/libmnl/patches/001-fix_build.patch | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/package/libs/libmnl/patches/001-fix_build.patch b/package/libs/libmnl/patches/001-fix_build.patch
new file mode 100644
index 0000000000..d095ec89d0
--- /dev/null
+++ b/package/libs/libmnl/patches/001-fix_build.patch
@@ -0,0 +1,11 @@
+--- a/doxygen/Makefile.am
++++ b/doxygen/Makefile.am
+@@ -21,7 +21,7 @@ doxyfile.stamp: $(doc_srcs) Makefile.am
+ # The command has to be a single line so the functions work
+ # and so `make` gives all lines to `bash -c`
+ # (hence ";\" at the end of every line but the last).
+-	/bin/bash -p -c 'declare -A renamed_page;\
++	bash -p -c 'declare -A renamed_page;\
+ main(){ set -e; cd man/man3; rm -f _*;\
+   count_real_pages;\
+   rename_real_pages;\