basic/math-util: drop libm where possible

- test-random-util is reworked to not use sqrt()
- pretty-print.c inlines ceil() so libm doesn't have
  to be linked into libshared
- We add fno-math-errno to allow inlining of more math
  functions by not requiring standard math functions to 
  set errno on invalid input.

src/basic/meson.build

@@ -215,7 +215,6 @@ libbasic_static = static_library(
         dependencies : [libbzip2_cflags,
                         libgcrypt_cflags,
                         liblz4_cflags,
-                        libm,
                         libxz_cflags,
                         libz_cflags,
                         libzstd_cflags,