build: do not apply curl debug macros to tests/server by default

It seems unnecessary and possibly unexpected to build test servers with
debug-enabled features and memory tracking whenever the tested curl is
built like that (which is a requirement for some tests, so curl is
mostly built like that when running tests.) It also makes building
servers a little bit faster with cmake for the most common cases.

You can apply debug options to `tests/server` with these new options:
- `./configure`: `--enable-server-debug`.
- cmake: `-DENABLE_SERVER_DEBUG`.

Also sync the way we pass these macros in autotools, with CMake builds.
Before this patch, autotools passed them via `curl_config.h`. After this
patch it passes them on the command-line, like cmake builds do.

This patch also make these option no longer passed to examples and
`http/client` in cmake builds, where they were no-ops anyway.

Ref: #15000
Closes #16705

lib/CMakeLists.txt

@@ -24,6 +24,7 @@
 set(LIB_NAME "libcurl")
 set(LIBCURL_OUTPUT_NAME "libcurl" CACHE STRING "Basename of the curl library")
 set_property(DIRECTORY APPEND PROPERTY COMPILE_DEFINITIONS "BUILDING_LIBCURL")
+set_property(DIRECTORY APPEND PROPERTY COMPILE_DEFINITIONS "${CURL_DEBUG_MACROS}")
 
 configure_file("curl_config.h.cmake" "${CMAKE_CURRENT_BINARY_DIR}/curl_config.h")
 

lib/Makefile.am

@@ -64,6 +64,12 @@ include Makefile.soname
 AM_CPPFLAGS += -DBUILDING_LIBCURL
 AM_LDFLAGS =
 AM_CFLAGS =
+if DEBUGBUILD
+AM_CPPFLAGS += -DDEBUGBUILD
+endif
+if CURLDEBUG
+AM_CPPFLAGS += -DCURLDEBUG
+endif
 
 # Makefile.inc provides the CSOURCES and HHEADERS defines
 include Makefile.inc