add launchpad bug reports without comments

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+Compilation fails due to zstd qcow2 compression
+
+Compilation of QEMU fails when using recent versions of zstd.
+
+I use the following commands to compile QEMU:
+$ mkdir build
+$ cd build
+$ ../configure --enable-debug --target-list=x86_64-softmmu
+$ make -j $(nproc)
+
+Here is a paste from the ../configure output:
+https://paste.ubuntu.com/p/dHsWzGV7TH/
+
+And one from the make output:
+https://paste.ubuntu.com/p/89qKk4NrFz/
+
+In short the error boils down to:
+../block/qcow2-threads.c: In function ‘qcow2_zstd_compress’:
+../block/qcow2-threads.c:225:16: error: implicit declaration of function ‘ZSTD_compressStream2’; did you mean ‘ZSTD_compressStream’? [-Werror=implicit-function-declaration]
+  225 |     zstd_ret = ZSTD_compressStream2(cctx, &output, &input, ZSTD_e_end);
+      |                ^~~~~~~~~~~~~~~~~~~~
+      |                ZSTD_compressStream
+../block/qcow2-threads.c:225:16: error: nested extern declaration of ‘ZSTD_compressStream2’ [-Werror=nested-externs]
+../block/qcow2-threads.c:225:60: error: ‘ZSTD_e_end’ undeclared (first use in this function)
+  225 |     zstd_ret = ZSTD_compressStream2(cctx, &output, &input, ZSTD_e_end);
+      |
+
+System info:
+QEMU commit: 7ef8134565dccf9186d5eabd7dbb4ecae6dead87 (from Github)
+Kernel: 5.10.15
+zstd: 1.4.8
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