compiling issue
Description of problem:
compilation error issue while building for qemu-riscv32-static
Steps to reproduce:
1.git clone https://github.com/qemu/qemu.git

2. ./configure --static --disable-system --target-list=riscv32-linux-user


issue output:
```
/usr/lib/gcc/x86_64-linux-gnu/7/../../../x86_64-linux-gnu/libglib-2.0.a(libglib_2_0_la-gutils.o): In function `g_get_user_database_entry':
(.text+0x267): warning: Using 'getpwuid' in statically linked applications requires at runtime the shared libraries from the glibc version used for linking
(.text+0xdd): warning: Using 'getpwnam_r' in statically linked applications requires at runtime the shared libraries from the glibc version used for linking
(.text+0x11b): warning: Using 'getpwuid_r' in statically linked applications requires at runtime the shared libraries from the glibc version used for linking
[954/960] Compiling C object tests/unit/test-string-output-visitor.p/test-string-output-visitor.c.o
[955/960] Linking target tests/unit/test-string-output-visitor
/usr/lib/gcc/x86_64-linux-gnu/7/../../../x86_64-linux-gnu/libglib-2.0.a(libglib_2_0_la-gutils.o): In function `g_get_user_database_entry':
(.text+0x267): warning: Using 'getpwuid' in statically linked applications requires at runtime the shared libraries from the glibc version used for linking
(.text+0xdd): warning: Using 'getpwnam_r' in statically linked applications requires at runtime the shared libraries from the glibc version used for linking
(.text+0x11b): warning: Using 'getpwuid_r' in statically linked applications requires at runtime the shared libraries from the glibc version used for linking
[956/960] Compiling C object tests/unit/test-string-input-visitor.p/test-string-input-visitor.c.o
[957/960] Linking target tests/unit/test-string-input-visitor
/usr/lib/gcc/x86_64-linux-gnu/7/../../../x86_64-linux-gnu/libglib-2.0.a(libglib_2_0_la-gutils.o): In function `g_get_user_database_entry':
(.text+0x267): warning: Using 'getpwuid' in statically linked applications requires at runtime the shared libraries from the glibc version used for linking
(.text+0xdd): warning: Using 'getpwnam_r' in statically linked applications requires at runtime the shared libraries from the glibc version used for linking
(.text+0x11b): warning: Using 'getpwuid_r' in statically linked applications requires at runtime the shared libraries from the glibc version used for linking
[958/960] Linking target tests/unit/test-x86-cpuid
/usr/lib/gcc/x86_64-linux-gnu/7/../../../x86_64-linux-gnu/libglib-2.0.a(libglib_2_0_la-gutils.o): In function `g_get_user_database_entry':
(.text+0x267): warning: Using 'getpwuid' in statically linked applications requires at runtime the shared libraries from the glibc version used for linking
(.text+0xdd): warning: Using 'getpwnam_r' in statically linked applications requires at runtime the shared libraries from the glibc version used for linking
(.text+0x11b): warning: Using 'getpwuid_r' in statically linked applications requires at runtime the shared libraries from the glibc version used for linking
[959/960] Compiling C object tests/unit/test-visitor-serialization.p/test-visitor-serialization.c.o
[960/960] Linking target tests/unit/test-visitor-serialization
/usr/lib/gcc/x86_64-linux-gnu/7/../../../x86_64-linux-gnu/libglib-2.0.a(libglib_2_0_la-gutils.o): In function `g_get_user_database_entry':
(.text+0x267): warning: Using 'getpwuid' in statically linked applications requires at runtime the shared libraries from the glibc version used for linking
(.text+0xdd): warning: Using 'getpwnam_r' in statically linked applications requires at runtime the shared libraries from the glibc version used for linking
(.text+0x11b): warning: Using 'getpwuid_r' in statically linked applications requires at runtime the shared libraries from the glibc version used for linking
make[1]: Leaving directory '/home/sadiq/work/qemu/build'
changing dir to build for make ""...
make[1]: Entering directory '/home/sadiq/work/qemu/build'
  GIT     ui/keycodemapdb meson tests/fp/berkeley-testfloat-3 tests/fp/berkeley-softfloat-3 dtc capstone slirp
[1/3] Generating qemu-version.h with a custom command (wrapped by meson to capture output)
make[1]: Leaving directory '/home/sadiq/work/qemu/build'
```

Any suggestions to resolve the issue would be helpful

Thanks