Fix implicit declaration of 'strncasecmp'

[tstellar]

strncasecmp is declared in strings.h but the strings.h file included with the project was being included instead of strings.h from glibc.

[fweimer-rh]

I think changing the -I path is cleaner (do all compilers support -iquote)?

diff --git a/src/Makefile b/src/Makefile
index 0d37e9f..bee0988 100644
--- a/src/Makefile
+++ b/src/Makefile
@@ -16,7 +16,7 @@ endif
 
 # Find the OS
 uname_S := $(shell sh -c 'uname -s 2>/dev/null || echo not')
-INCLUDE_DIRS = -I"$(RM_INCLUDE_DIR)" -I"$(DEPS_DIR)/jsonsl"  -I"$(DEPS_DIR)/RedisModuleSDK/rmutil"
+INCLUDE_DIRS = -I"$(RM_INCLUDE_DIR)" -I"$(DEPS_DIR)/jsonsl" -I"$(DEPS_DIR)/RedisModuleSDK"
 CFLAGS = $(INCLUDE_DIRS) -Wall $(DEBUGFLAGS) -fPIC -std=gnu99  -D_GNU_SOURCE
 CC:=$(shell sh -c 'type $(CC) >/dev/null 2>/dev/null && echo $(CC) || echo gcc')
 

And then change the few places from <sds.h> to "rmutil/sds.h". No changes with the rmutil subdirectory (or anything else under deps/) are required. This avoids potential further shadowing.