Merge bitcoin#30588: depends: fix ZMQ CMake getcachesize check

a0a9a11 depends: fix ZMQ CMake getcachesize check (fanquake)

Pull request description:

  Fixes bitcoin#30587.

ACKs for top commit:
  maflcko:
    ACK a0a9a11
  hebasto:
    ACK a0a9a11. On Ubuntu (s390x), I was able to reproduce bitcoin#30587. With this PR building `zeromq` succeeds.
  TheCharlatan:
    ACK a0a9a11

Tree-SHA512: 70ca50ebe8e36d5a10a2354a1fbed49f5f802ae5115e09686bccca7e5d1da35168e84a6cab40dd2c83f8918889cdfdcbd5d1cbe25273b844c8ddd21865ea6c51

depends/packages/zeromq.mk

@@ -10,6 +10,7 @@ $(package)_patches += builtin_sha1.patch
 $(package)_patches += fix_have_windows.patch
 $(package)_patches += openbsd_kqueue_headers.patch
 $(package)_patches += cmake_minimum.patch
+$(package)_patches += cacheline_undefined.patch
 $(package)_patches += no_librt.patch
 
 define $(package)_set_vars
@@ -25,6 +26,7 @@ define $(package)_preprocess_cmds
   patch -p1 < $($(package)_patch_dir)/remove_libstd_link.patch && \
   patch -p1 < $($(package)_patch_dir)/macos_mktemp_check.patch && \
   patch -p1 < $($(package)_patch_dir)/builtin_sha1.patch && \
+  patch -p1 < $($(package)_patch_dir)/cacheline_undefined.patch && \
   patch -p1 < $($(package)_patch_dir)/fix_have_windows.patch && \
   patch -p1 < $($(package)_patch_dir)/openbsd_kqueue_headers.patch && \
   patch -p1 < $($(package)_patch_dir)/cmake_minimum.patch && \

depends/patches/zeromq/cacheline_undefined.patch

@@ -0,0 +1,15 @@
+Use proper STREQUAL instead of EQUAL to compare strings.txt
+
+See: https://github.com/zeromq/libzmq/pull/4711.
+
+--- a/CMakeLists.txt
++++ b/CMakeLists.txt
+@@ -476,7 +476,7 @@ execute_process(
+ if(CACHELINE_SIZE STREQUAL ""
+    OR CACHELINE_SIZE EQUAL 0
+    OR CACHELINE_SIZE EQUAL -1
+-   OR CACHELINE_SIZE EQUAL "undefined")
++   OR CACHELINE_SIZE STREQUAL "undefined")
+   set(ZMQ_CACHELINE_SIZE 64)
+ else()
+   set(ZMQ_CACHELINE_SIZE ${CACHELINE_SIZE})