build: only compile simdutf if there is CXX support

Commit 3b04755
"build: lib: Bundle simdutf amalgamation v5.5.0",
added support for simdutf, and enforces CXX support if
FLB_UNICODE_ENCODER is selected. Which is the default case,
fix that now.

Signed-off-by: Thomas Devoogdt <[email protected]>

Author: ThomasDevoogdt

CMakeLists.txt

@@ -139,7 +139,7 @@ option(FLB_COVERAGE            "Build with code-coverage"      No)
 option(FLB_JEMALLOC            "Build with Jemalloc support"   No)
 option(FLB_REGEX               "Build with Regex support"     Yes)
 option(FLB_UTF8_ENCODER        "Build with UTF8 encoding support" Yes)
-option(FLB_UNICODE_ENCODER     "Build with Unicode (UTF-16LE, UTF-16BE) encoding support" Yes)
+option(FLB_UNICODE_ENCODER     "Build with Unicode (UTF-16LE, UTF-16BE) encoding support" CMAKE_CXX_COMPILER)
 option(FLB_PARSER              "Build with Parser support"    Yes)
 option(FLB_TLS                 "Build with SSL/TLS support"   Yes)
 option(FLB_BINARY              "Build executable binary"      Yes)